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Finding the Fourth Proportional to 717.20, 988.62 and 495.77

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Solution

The fourth proportional to 717.20, 988.62 and 495.77 is: 683.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.20 : 988.62 = 495.77 : x
  2. Step 2: Convert to fraction form
    717.20/988.62 = 495.77/x
  3. Step 3: Cross multiply
    717.20x = 988.62 × 495.77
  4. Step 4: Simplify right side
    717.20x = 490,123.19
  5. Step 5: Solve for x
    x = 490,123.19/717.20
  6. Step 6: Final answer
    x = 683.39

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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.