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Finding the Fourth Proportional to 946.38, 1,306.80 and 615.38

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Solution

The fourth proportional to 946.38, 1,306.80 and 615.38 is: 849.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.38 : 1,306.80 = 615.38 : x
  2. Step 2: Convert to fraction form
    946.38/1,306.80 = 615.38/x
  3. Step 3: Cross multiply
    946.38x = 1,306.80 × 615.38
  4. Step 4: Simplify right side
    946.38x = 804,178.58
  5. Step 5: Solve for x
    x = 804,178.58/946.38
  6. Step 6: Final answer
    x = 849.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.