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Finding the Fourth Proportional to 2,572.80, 3,859.20 and 929.40

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Solution

The fourth proportional to 2,572.80, 3,859.20 and 929.40 is: 1,394.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,572.80 : 3,859.20 = 929.40 : x
  2. Step 2: Convert to fraction form
    2,572.80/3,859.20 = 929.40/x
  3. Step 3: Cross multiply
    2,572.80x = 3,859.20 × 929.40
  4. Step 4: Simplify right side
    2,572.80x = 3,586,740.48
  5. Step 5: Solve for x
    x = 3,586,740.48/2,572.80
  6. Step 6: Final answer
    x = 1,394.10

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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.