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Finding the Fourth Proportional to 1,785.76, 2,679.12 and 631.52

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Solution

The fourth proportional to 1,785.76, 2,679.12 and 631.52 is: 947.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.76 : 2,679.12 = 631.52 : x
  2. Step 2: Convert to fraction form
    1,785.76/2,679.12 = 631.52/x
  3. Step 3: Cross multiply
    1,785.76x = 2,679.12 × 631.52
  4. Step 4: Simplify right side
    1,785.76x = 1,691,917.86
  5. Step 5: Solve for x
    x = 1,691,917.86/1,785.76
  6. Step 6: Final answer
    x = 947.45

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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.