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Finding the Fourth Proportional to 1,127.96, 1,690.49 and 981.10

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Solution

The fourth proportional to 1,127.96, 1,690.49 and 981.10 is: 1,470.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.96 : 1,690.49 = 981.10 : x
  2. Step 2: Convert to fraction form
    1,127.96/1,690.49 = 981.10/x
  3. Step 3: Cross multiply
    1,127.96x = 1,690.49 × 981.10
  4. Step 4: Simplify right side
    1,127.96x = 1,658,537.97
  5. Step 5: Solve for x
    x = 1,658,537.97/1,127.96
  6. Step 6: Final answer
    x = 1,470.39

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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.