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Finding the Fourth Proportional to 874.47, 1,312.38 and 387.86

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Solution

The fourth proportional to 874.47, 1,312.38 and 387.86 is: 582.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.47 : 1,312.38 = 387.86 : x
  2. Step 2: Convert to fraction form
    874.47/1,312.38 = 387.86/x
  3. Step 3: Cross multiply
    874.47x = 1,312.38 × 387.86
  4. Step 4: Simplify right side
    874.47x = 509,013.14
  5. Step 5: Solve for x
    x = 509,013.14/874.47
  6. Step 6: Final answer
    x = 582.08

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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.