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Finding the Fourth Proportional to 1,111.17, 1,663.26 and 762.47

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Solution

The fourth proportional to 1,111.17, 1,663.26 and 762.47 is: 1,141.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.17 : 1,663.26 = 762.47 : x
  2. Step 2: Convert to fraction form
    1,111.17/1,663.26 = 762.47/x
  3. Step 3: Cross multiply
    1,111.17x = 1,663.26 × 762.47
  4. Step 4: Simplify right side
    1,111.17x = 1,268,179.61
  5. Step 5: Solve for x
    x = 1,268,179.61/1,111.17
  6. Step 6: Final answer
    x = 1,141.30

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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.