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Finding the Fourth Proportional to 1,117.44, 1,675.80 and 727.20

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Solution

The fourth proportional to 1,117.44, 1,675.80 and 727.20 is: 1,090.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.44 : 1,675.80 = 727.20 : x
  2. Step 2: Convert to fraction form
    1,117.44/1,675.80 = 727.20/x
  3. Step 3: Cross multiply
    1,117.44x = 1,675.80 × 727.20
  4. Step 4: Simplify right side
    1,117.44x = 1,218,641.76
  5. Step 5: Solve for x
    x = 1,218,641.76/1,117.44
  6. Step 6: Final answer
    x = 1,090.57

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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.