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Finding the Fourth Proportional to 874.74, 1,312.17 and 289.71

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Solution

The fourth proportional to 874.74, 1,312.17 and 289.71 is: 434.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.74 : 1,312.17 = 289.71 : x
  2. Step 2: Convert to fraction form
    874.74/1,312.17 = 289.71/x
  3. Step 3: Cross multiply
    874.74x = 1,312.17 × 289.71
  4. Step 4: Simplify right side
    874.74x = 380,155.66
  5. Step 5: Solve for x
    x = 380,155.66/874.74
  6. Step 6: Final answer
    x = 434.59

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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.