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Finding the Fourth Proportional to 1,314.07, 1,972.12 and 981.35

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Solution

The fourth proportional to 1,314.07, 1,972.12 and 981.35 is: 1,472.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.07 : 1,972.12 = 981.35 : x
  2. Step 2: Convert to fraction form
    1,314.07/1,972.12 = 981.35/x
  3. Step 3: Cross multiply
    1,314.07x = 1,972.12 × 981.35
  4. Step 4: Simplify right side
    1,314.07x = 1,935,335.06
  5. Step 5: Solve for x
    x = 1,935,335.06/1,314.07
  6. Step 6: Final answer
    x = 1,472.78

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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.