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Finding the Fourth Proportional to 979.48, 1,471.10 and 615

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Solution

The fourth proportional to 979.48, 1,471.10 and 615 is: 923.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.48 : 1,471.10 = 615 : x
  2. Step 2: Convert to fraction form
    979.48/1,471.10 = 615/x
  3. Step 3: Cross multiply
    979.48x = 1,471.10 × 615
  4. Step 4: Simplify right side
    979.48x = 904,726.50
  5. Step 5: Solve for x
    x = 904,726.50/979.48
  6. Step 6: Final answer
    x = 923.68

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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.