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Finding the Fourth Proportional to 1,291.71, 1,782.24 and 760.61

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Solution

The fourth proportional to 1,291.71, 1,782.24 and 760.61 is: 1,049.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.71 : 1,782.24 = 760.61 : x
  2. Step 2: Convert to fraction form
    1,291.71/1,782.24 = 760.61/x
  3. Step 3: Cross multiply
    1,291.71x = 1,782.24 × 760.61
  4. Step 4: Simplify right side
    1,291.71x = 1,355,585.76
  5. Step 5: Solve for x
    x = 1,355,585.76/1,291.71
  6. Step 6: Final answer
    x = 1,049.45

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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.