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Finding the Fourth Proportional to 2,520.57, 3,780.84 and 981.57

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Solution

The fourth proportional to 2,520.57, 3,780.84 and 981.57 is: 1,472.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,520.57 : 3,780.84 = 981.57 : x
  2. Step 2: Convert to fraction form
    2,520.57/3,780.84 = 981.57/x
  3. Step 3: Cross multiply
    2,520.57x = 3,780.84 × 981.57
  4. Step 4: Simplify right side
    2,520.57x = 3,711,159.12
  5. Step 5: Solve for x
    x = 3,711,159.12/2,520.57
  6. Step 6: Final answer
    x = 1,472.35

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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.