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Finding the Fourth Proportional to 1,981.67, 2,972.48 and 520.83

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Solution

The fourth proportional to 1,981.67, 2,972.48 and 520.83 is: 781.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.67 : 2,972.48 = 520.83 : x
  2. Step 2: Convert to fraction form
    1,981.67/2,972.48 = 520.83/x
  3. Step 3: Cross multiply
    1,981.67x = 2,972.48 × 520.83
  4. Step 4: Simplify right side
    1,981.67x = 1,548,154.15
  5. Step 5: Solve for x
    x = 1,548,154.15/1,981.67
  6. Step 6: Final answer
    x = 781.24

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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.