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Finding the Fourth Proportional to 520,539.31, 718,330.76 and 287,974.84

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Solution

The fourth proportional to 520,539.31, 718,330.76 and 287,974.84 is: 397,397.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,539.31 : 718,330.76 = 287,974.84 : x
  2. Step 2: Convert to fraction form
    520,539.31/718,330.76 = 287,974.84/x
  3. Step 3: Cross multiply
    520,539.31x = 718,330.76 × 287,974.84
  4. Step 4: Simplify right side
    520,539.31x = 206,861,180,646.55
  5. Step 5: Solve for x
    x = 206,861,180,646.55/520,539.31
  6. Step 6: Final answer
    x = 397,397.81

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1.5x scale

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.