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Finding the Fourth Proportional to 839.71, 1,158.50 and 520.43

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Solution

The fourth proportional to 839.71, 1,158.50 and 520.43 is: 718.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.71 : 1,158.50 = 520.43 : x
  2. Step 2: Convert to fraction form
    839.71/1,158.50 = 520.43/x
  3. Step 3: Cross multiply
    839.71x = 1,158.50 × 520.43
  4. Step 4: Simplify right side
    839.71x = 602,909.76
  5. Step 5: Solve for x
    x = 602,909.76/839.71
  6. Step 6: Final answer
    x = 718.00

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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.