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Finding the Fourth Proportional to 1,115.45, 1,673.20 and 385.01

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Solution

The fourth proportional to 1,115.45, 1,673.20 and 385.01 is: 577.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.45 : 1,673.20 = 385.01 : x
  2. Step 2: Convert to fraction form
    1,115.45/1,673.20 = 385.01/x
  3. Step 3: Cross multiply
    1,115.45x = 1,673.20 × 385.01
  4. Step 4: Simplify right side
    1,115.45x = 644,198.73
  5. Step 5: Solve for x
    x = 644,198.73/1,115.45
  6. Step 6: Final answer
    x = 577.52

Related Problems

Find fourth proportional to 557.73, 836.60 and 192.51
Half scale
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Double scale
Find fourth proportional to 1,116.45, 1,674.70 and 386.01
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.