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Finding the Fourth Proportional to 716,246.40, 988,420.50 and 393,981

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Solution

The fourth proportional to 716,246.40, 988,420.50 and 393,981 is: 543,694.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,246.40 : 988,420.50 = 393,981 : x
  2. Step 2: Convert to fraction form
    716,246.40/988,420.50 = 393,981/x
  3. Step 3: Cross multiply
    716,246.40x = 988,420.50 × 393,981
  4. Step 4: Simplify right side
    716,246.40x = 389,418,897,010.50
  5. Step 5: Solve for x
    x = 389,418,897,010.50/716,246.40
  6. Step 6: Final answer
    x = 543,694.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.