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Finding the Fourth Proportional to 1,109.61, 1,531.23 and 637.50

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Solution

The fourth proportional to 1,109.61, 1,531.23 and 637.50 is: 879.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.61 : 1,531.23 = 637.50 : x
  2. Step 2: Convert to fraction form
    1,109.61/1,531.23 = 637.50/x
  3. Step 3: Cross multiply
    1,109.61x = 1,531.23 × 637.50
  4. Step 4: Simplify right side
    1,109.61x = 976,159.13
  5. Step 5: Solve for x
    x = 976,159.13/1,109.61
  6. Step 6: Final answer
    x = 879.73

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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.