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Finding the Fourth Proportional to 1,981.83, 2,972.62 and 520.98

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Solution

The fourth proportional to 1,981.83, 2,972.62 and 520.98 is: 781.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.83 : 2,972.62 = 520.98 : x
  2. Step 2: Convert to fraction form
    1,981.83/2,972.62 = 520.98/x
  3. Step 3: Cross multiply
    1,981.83x = 2,972.62 × 520.98
  4. Step 4: Simplify right side
    1,981.83x = 1,548,675.57
  5. Step 5: Solve for x
    x = 1,548,675.57/1,981.83
  6. Step 6: Final answer
    x = 781.44

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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.