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Finding the Fourth Proportional to 688.14, 1,032.21 and 379.94

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Solution

The fourth proportional to 688.14, 1,032.21 and 379.94 is: 569.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.14 : 1,032.21 = 379.94 : x
  2. Step 2: Convert to fraction form
    688.14/1,032.21 = 379.94/x
  3. Step 3: Cross multiply
    688.14x = 1,032.21 × 379.94
  4. Step 4: Simplify right side
    688.14x = 392,172.71
  5. Step 5: Solve for x
    x = 392,172.71/688.14
  6. Step 6: Final answer
    x = 569.90

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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.