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Finding the Fourth Proportional to 931.50, 1,387.94 and 875.61

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Solution

The fourth proportional to 931.50, 1,387.94 and 875.61 is: 1,304.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.50 : 1,387.94 = 875.61 : x
  2. Step 2: Convert to fraction form
    931.50/1,387.94 = 875.61/x
  3. Step 3: Cross multiply
    931.50x = 1,387.94 × 875.61
  4. Step 4: Simplify right side
    931.50x = 1,215,289.77
  5. Step 5: Solve for x
    x = 1,215,289.77/931.50
  6. Step 6: Final answer
    x = 1,304.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.