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Finding the Fourth Proportional to 1,127.65, 1,690.33 and 762.48

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Solution

The fourth proportional to 1,127.65, 1,690.33 and 762.48 is: 1,142.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.65 : 1,690.33 = 762.48 : x
  2. Step 2: Convert to fraction form
    1,127.65/1,690.33 = 762.48/x
  3. Step 3: Cross multiply
    1,127.65x = 1,690.33 × 762.48
  4. Step 4: Simplify right side
    1,127.65x = 1,288,842.82
  5. Step 5: Solve for x
    x = 1,288,842.82/1,127.65
  6. Step 6: Final answer
    x = 1,142.95

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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.