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Finding the Fourth Proportional to 717.88, 990.38 and 614.20

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Solution

The fourth proportional to 717.88, 990.38 and 614.20 is: 847.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.88 : 990.38 = 614.20 : x
  2. Step 2: Convert to fraction form
    717.88/990.38 = 614.20/x
  3. Step 3: Cross multiply
    717.88x = 990.38 × 614.20
  4. Step 4: Simplify right side
    717.88x = 608,291.40
  5. Step 5: Solve for x
    x = 608,291.40/717.88
  6. Step 6: Final answer
    x = 847.34

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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.