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Finding the Fourth Proportional to 1,639.76, 2,456.76 and 772.88

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Solution

The fourth proportional to 1,639.76, 2,456.76 and 772.88 is: 1,157.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.76 : 2,456.76 = 772.88 : x
  2. Step 2: Convert to fraction form
    1,639.76/2,456.76 = 772.88/x
  3. Step 3: Cross multiply
    1,639.76x = 2,456.76 × 772.88
  4. Step 4: Simplify right side
    1,639.76x = 1,898,780.67
  5. Step 5: Solve for x
    x = 1,898,780.67/1,639.76
  6. Step 6: Final answer
    x = 1,157.96

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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.