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Finding the Fourth Proportional to 1,981.76, 2,972.66 and 521.06

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Solution

The fourth proportional to 1,981.76, 2,972.66 and 521.06 is: 781.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.76 : 2,972.66 = 521.06 : x
  2. Step 2: Convert to fraction form
    1,981.76/2,972.66 = 521.06/x
  3. Step 3: Cross multiply
    1,981.76x = 2,972.66 × 521.06
  4. Step 4: Simplify right side
    1,981.76x = 1,548,916.75
  5. Step 5: Solve for x
    x = 1,548,916.75/1,981.76
  6. Step 6: Final answer
    x = 781.59

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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.