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Finding the Fourth Proportional to 688.29, 1,032.69 and 611.83

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Solution

The fourth proportional to 688.29, 1,032.69 and 611.83 is: 917.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.29 : 1,032.69 = 611.83 : x
  2. Step 2: Convert to fraction form
    688.29/1,032.69 = 611.83/x
  3. Step 3: Cross multiply
    688.29x = 1,032.69 × 611.83
  4. Step 4: Simplify right side
    688.29x = 631,830.72
  5. Step 5: Solve for x
    x = 631,830.72/688.29
  6. Step 6: Final answer
    x = 917.97

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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.