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Finding the Fourth Proportional to 691.80, 1,038.33 and 281.22

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Solution

The fourth proportional to 691.80, 1,038.33 and 281.22 is: 422.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.80 : 1,038.33 = 281.22 : x
  2. Step 2: Convert to fraction form
    691.80/1,038.33 = 281.22/x
  3. Step 3: Cross multiply
    691.80x = 1,038.33 × 281.22
  4. Step 4: Simplify right side
    691.80x = 291,999.16
  5. Step 5: Solve for x
    x = 291,999.16/691.80
  6. Step 6: Final answer
    x = 422.09

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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.