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Finding the Fourth Proportional to 615.39, 921.70 and 354.77

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Solution

The fourth proportional to 615.39, 921.70 and 354.77 is: 531.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.39 : 921.70 = 354.77 : x
  2. Step 2: Convert to fraction form
    615.39/921.70 = 354.77/x
  3. Step 3: Cross multiply
    615.39x = 921.70 × 354.77
  4. Step 4: Simplify right side
    615.39x = 326,988.80
  5. Step 5: Solve for x
    x = 326,988.80/615.39
  6. Step 6: Final answer
    x = 531.36

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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.