Home / 1,539.40-2,309.12-385.15

Finding the Fourth Proportional to 1,539.40, 2,309.12 and 385.15

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Solution

The fourth proportional to 1,539.40, 2,309.12 and 385.15 is: 577.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.40 : 2,309.12 = 385.15 : x
  2. Step 2: Convert to fraction form
    1,539.40/2,309.12 = 385.15/x
  3. Step 3: Cross multiply
    1,539.40x = 2,309.12 × 385.15
  4. Step 4: Simplify right side
    1,539.40x = 889,344.10
  5. Step 5: Solve for x
    x = 889,344.10/1,539.40
  6. Step 6: Final answer
    x = 577.72

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Double scale
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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.