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Finding the Fourth Proportional to 717.61, 988.59 and 507.55

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Solution

The fourth proportional to 717.61, 988.59 and 507.55 is: 699.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.61 : 988.59 = 507.55 : x
  2. Step 2: Convert to fraction form
    717.61/988.59 = 507.55/x
  3. Step 3: Cross multiply
    717.61x = 988.59 × 507.55
  4. Step 4: Simplify right side
    717.61x = 501,758.85
  5. Step 5: Solve for x
    x = 501,758.85/717.61
  6. Step 6: Final answer
    x = 699.21

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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.