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Finding the Fourth Proportional to 508,719.80, 763,079.70 and 390,985.40

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Solution

The fourth proportional to 508,719.80, 763,079.70 and 390,985.40 is: 586,478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,719.80 : 763,079.70 = 390,985.40 : x
  2. Step 2: Convert to fraction form
    508,719.80/763,079.70 = 390,985.40/x
  3. Step 3: Cross multiply
    508,719.80x = 763,079.70 × 390,985.40
  4. Step 4: Simplify right side
    508,719.80x = 298,353,021,736.38
  5. Step 5: Solve for x
    x = 298,353,021,736.38/508,719.80
  6. Step 6: Final answer
    x = 586,478.10

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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.