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Finding the Fourth Proportional to 1,126.32, 1,687.68 and 548.16

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Solution

The fourth proportional to 1,126.32, 1,687.68 and 548.16 is: 821.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.32 : 1,687.68 = 548.16 : x
  2. Step 2: Convert to fraction form
    1,126.32/1,687.68 = 548.16/x
  3. Step 3: Cross multiply
    1,126.32x = 1,687.68 × 548.16
  4. Step 4: Simplify right side
    1,126.32x = 925,118.67
  5. Step 5: Solve for x
    x = 925,118.67/1,126.32
  6. Step 6: Final answer
    x = 821.36

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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.