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Finding the Fourth Proportional to 717.30, 989.55 and 520.74

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Solution

The fourth proportional to 717.30, 989.55 and 520.74 is: 718.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.30 : 989.55 = 520.74 : x
  2. Step 2: Convert to fraction form
    717.30/989.55 = 520.74/x
  3. Step 3: Cross multiply
    717.30x = 989.55 × 520.74
  4. Step 4: Simplify right side
    717.30x = 515,298.27
  5. Step 5: Solve for x
    x = 515,298.27/717.30
  6. Step 6: Final answer
    x = 718.39

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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.