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Finding the Fourth Proportional to 874.68, 1,312.20 and 711.96

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Solution

The fourth proportional to 874.68, 1,312.20 and 711.96 is: 1,068.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.68 : 1,312.20 = 711.96 : x
  2. Step 2: Convert to fraction form
    874.68/1,312.20 = 711.96/x
  3. Step 3: Cross multiply
    874.68x = 1,312.20 × 711.96
  4. Step 4: Simplify right side
    874.68x = 934,233.91
  5. Step 5: Solve for x
    x = 934,233.91/874.68
  6. Step 6: Final answer
    x = 1,068.09

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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.