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Finding the Fourth Proportional to 688.60, 1,034.95 and 637.69

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Solution

The fourth proportional to 688.60, 1,034.95 and 637.69 is: 958.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.60 : 1,034.95 = 637.69 : x
  2. Step 2: Convert to fraction form
    688.60/1,034.95 = 637.69/x
  3. Step 3: Cross multiply
    688.60x = 1,034.95 × 637.69
  4. Step 4: Simplify right side
    688.60x = 659,973.65
  5. Step 5: Solve for x
    x = 659,973.65/688.60
  6. Step 6: Final answer
    x = 958.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.