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Finding the Fourth Proportional to 1,125.16, 1,686.12 and 637

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Solution

The fourth proportional to 1,125.16, 1,686.12 and 637 is: 954.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.16 : 1,686.12 = 637 : x
  2. Step 2: Convert to fraction form
    1,125.16/1,686.12 = 637/x
  3. Step 3: Cross multiply
    1,125.16x = 1,686.12 × 637
  4. Step 4: Simplify right side
    1,125.16x = 1,074,058.44
  5. Step 5: Solve for x
    x = 1,074,058.44/1,125.16
  6. Step 6: Final answer
    x = 954.58

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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.