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Finding the Fourth Proportional to 1,047.92, 1,570.20 and 615.44

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Solution

The fourth proportional to 1,047.92, 1,570.20 and 615.44 is: 922.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.92 : 1,570.20 = 615.44 : x
  2. Step 2: Convert to fraction form
    1,047.92/1,570.20 = 615.44/x
  3. Step 3: Cross multiply
    1,047.92x = 1,570.20 × 615.44
  4. Step 4: Simplify right side
    1,047.92x = 966,363.89
  5. Step 5: Solve for x
    x = 966,363.89/1,047.92
  6. Step 6: Final answer
    x = 922.17

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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.