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Finding the Fourth Proportional to 717.93, 990.69 and 469.74

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Solution

The fourth proportional to 717.93, 990.69 and 469.74 is: 648.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.93 : 990.69 = 469.74 : x
  2. Step 2: Convert to fraction form
    717.93/990.69 = 469.74/x
  3. Step 3: Cross multiply
    717.93x = 990.69 × 469.74
  4. Step 4: Simplify right side
    717.93x = 465,366.72
  5. Step 5: Solve for x
    x = 465,366.72/717.93
  6. Step 6: Final answer
    x = 648.21

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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.