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Finding the Fourth Proportional to 1,109.88, 1,531.80 and 637.86

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Solution

The fourth proportional to 1,109.88, 1,531.80 and 637.86 is: 880.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.88 : 1,531.80 = 637.86 : x
  2. Step 2: Convert to fraction form
    1,109.88/1,531.80 = 637.86/x
  3. Step 3: Cross multiply
    1,109.88x = 1,531.80 × 637.86
  4. Step 4: Simplify right side
    1,109.88x = 977,073.95
  5. Step 5: Solve for x
    x = 977,073.95/1,109.88
  6. Step 6: Final answer
    x = 880.34

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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.