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Finding the Fourth Proportional to 1,045.47, 1,565.46 and 679.71

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Solution

The fourth proportional to 1,045.47, 1,565.46 and 679.71 is: 1,017.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.47 : 1,565.46 = 679.71 : x
  2. Step 2: Convert to fraction form
    1,045.47/1,565.46 = 679.71/x
  3. Step 3: Cross multiply
    1,045.47x = 1,565.46 × 679.71
  4. Step 4: Simplify right side
    1,045.47x = 1,064,058.82
  5. Step 5: Solve for x
    x = 1,064,058.82/1,045.47
  6. Step 6: Final answer
    x = 1,017.78

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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.