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Finding the Fourth Proportional to 688.72, 1,032.88 and 201.76

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Solution

The fourth proportional to 688.72, 1,032.88 and 201.76 is: 302.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.72 : 1,032.88 = 201.76 : x
  2. Step 2: Convert to fraction form
    688.72/1,032.88 = 201.76/x
  3. Step 3: Cross multiply
    688.72x = 1,032.88 × 201.76
  4. Step 4: Simplify right side
    688.72x = 208,393.87
  5. Step 5: Solve for x
    x = 208,393.87/688.72
  6. Step 6: Final answer
    x = 302.58

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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.