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Finding the Fourth Proportional to 688.39, 1,032.59 and 168.40

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Solution

The fourth proportional to 688.39, 1,032.59 and 168.40 is: 252.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.39 : 1,032.59 = 168.40 : x
  2. Step 2: Convert to fraction form
    688.39/1,032.59 = 168.40/x
  3. Step 3: Cross multiply
    688.39x = 1,032.59 × 168.40
  4. Step 4: Simplify right side
    688.39x = 173,888.16
  5. Step 5: Solve for x
    x = 173,888.16/688.39
  6. Step 6: Final answer
    x = 252.60

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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.