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Finding the Fourth Proportional to 2,520.32, 3,780.48 and 981.68

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Solution

The fourth proportional to 2,520.32, 3,780.48 and 981.68 is: 1,472.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,520.32 : 3,780.48 = 981.68 : x
  2. Step 2: Convert to fraction form
    2,520.32/3,780.48 = 981.68/x
  3. Step 3: Cross multiply
    2,520.32x = 3,780.48 × 981.68
  4. Step 4: Simplify right side
    2,520.32x = 3,711,221.61
  5. Step 5: Solve for x
    x = 3,711,221.61/2,520.32
  6. Step 6: Final answer
    x = 1,472.52

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1.5x scale

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.