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Finding the Fourth Proportional to 1,047.38, 1,570.74 and 397.94

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Solution

The fourth proportional to 1,047.38, 1,570.74 and 397.94 is: 596.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.38 : 1,570.74 = 397.94 : x
  2. Step 2: Convert to fraction form
    1,047.38/1,570.74 = 397.94/x
  3. Step 3: Cross multiply
    1,047.38x = 1,570.74 × 397.94
  4. Step 4: Simplify right side
    1,047.38x = 625,060.28
  5. Step 5: Solve for x
    x = 625,060.28/1,047.38
  6. Step 6: Final answer
    x = 596.78

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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.