Home / 1,126.12-1,687.80-921.10

Finding the Fourth Proportional to 1,126.12, 1,687.80 and 921.10

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Solution

The fourth proportional to 1,126.12, 1,687.80 and 921.10 is: 1,380.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.12 : 1,687.80 = 921.10 : x
  2. Step 2: Convert to fraction form
    1,126.12/1,687.80 = 921.10/x
  3. Step 3: Cross multiply
    1,126.12x = 1,687.80 × 921.10
  4. Step 4: Simplify right side
    1,126.12x = 1,554,632.58
  5. Step 5: Solve for x
    x = 1,554,632.58/1,126.12
  6. Step 6: Final answer
    x = 1,380.52

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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.