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Finding the Fourth Proportional to 508,725.80, 763,088.70 and 390,991.40

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Solution

The fourth proportional to 508,725.80, 763,088.70 and 390,991.40 is: 586,487.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,725.80 : 763,088.70 = 390,991.40 : x
  2. Step 2: Convert to fraction form
    508,725.80/763,088.70 = 390,991.40/x
  3. Step 3: Cross multiply
    508,725.80x = 763,088.70 × 390,991.40
  4. Step 4: Simplify right side
    508,725.80x = 298,361,119,137.18
  5. Step 5: Solve for x
    x = 298,361,119,137.18/508,725.80
  6. Step 6: Final answer
    x = 586,487.10

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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.