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Finding the Fourth Proportional to 1,114.24, 1,537.76 and 642.16

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Solution

The fourth proportional to 1,114.24, 1,537.76 and 642.16 is: 886.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.24 : 1,537.76 = 642.16 : x
  2. Step 2: Convert to fraction form
    1,114.24/1,537.76 = 642.16/x
  3. Step 3: Cross multiply
    1,114.24x = 1,537.76 × 642.16
  4. Step 4: Simplify right side
    1,114.24x = 987,487.96
  5. Step 5: Solve for x
    x = 987,487.96/1,114.24
  6. Step 6: Final answer
    x = 886.24

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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.