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Finding the Fourth Proportional to 1,113.50, 1,670.42 and 383.28

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Solution

The fourth proportional to 1,113.50, 1,670.42 and 383.28 is: 574.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.50 : 1,670.42 = 383.28 : x
  2. Step 2: Convert to fraction form
    1,113.50/1,670.42 = 383.28/x
  3. Step 3: Cross multiply
    1,113.50x = 1,670.42 × 383.28
  4. Step 4: Simplify right side
    1,113.50x = 640,236.66
  5. Step 5: Solve for x
    x = 640,236.66/1,113.50
  6. Step 6: Final answer
    x = 574.98

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Double scale
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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.