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Finding the Fourth Proportional to 1,505.70, 2,077.65 and 981.90

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Solution

The fourth proportional to 1,505.70, 2,077.65 and 981.90 is: 1,354.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,505.70 : 2,077.65 = 981.90 : x
  2. Step 2: Convert to fraction form
    1,505.70/2,077.65 = 981.90/x
  3. Step 3: Cross multiply
    1,505.70x = 2,077.65 × 981.90
  4. Step 4: Simplify right side
    1,505.70x = 2,040,044.54
  5. Step 5: Solve for x
    x = 2,040,044.54/1,505.70
  6. Step 6: Final answer
    x = 1,354.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.