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Finding the Fourth Proportional to 688.35, 956.10 and 668.91

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Solution

The fourth proportional to 688.35, 956.10 and 668.91 is: 929.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.35 : 956.10 = 668.91 : x
  2. Step 2: Convert to fraction form
    688.35/956.10 = 668.91/x
  3. Step 3: Cross multiply
    688.35x = 956.10 × 668.91
  4. Step 4: Simplify right side
    688.35x = 639,545.57
  5. Step 5: Solve for x
    x = 639,545.57/688.35
  6. Step 6: Final answer
    x = 929.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.