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Finding the Fourth Proportional to 717.46, 987.80 and 623.90

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Solution

The fourth proportional to 717.46, 987.80 and 623.90 is: 858.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.46 : 987.80 = 623.90 : x
  2. Step 2: Convert to fraction form
    717.46/987.80 = 623.90/x
  3. Step 3: Cross multiply
    717.46x = 987.80 × 623.90
  4. Step 4: Simplify right side
    717.46x = 616,287.77
  5. Step 5: Solve for x
    x = 616,287.77/717.46
  6. Step 6: Final answer
    x = 858.99

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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.