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Finding the Fourth Proportional to 630.91, 874.03 and 615.79

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Solution

The fourth proportional to 630.91, 874.03 and 615.79 is: 853.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.91 : 874.03 = 615.79 : x
  2. Step 2: Convert to fraction form
    630.91/874.03 = 615.79/x
  3. Step 3: Cross multiply
    630.91x = 874.03 × 615.79
  4. Step 4: Simplify right side
    630.91x = 538,218.93
  5. Step 5: Solve for x
    x = 538,218.93/630.91
  6. Step 6: Final answer
    x = 853.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.