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Finding the Fourth Proportional to 1,127.90, 1,690.70 and 762.73

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Solution

The fourth proportional to 1,127.90, 1,690.70 and 762.73 is: 1,143.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.90 : 1,690.70 = 762.73 : x
  2. Step 2: Convert to fraction form
    1,127.90/1,690.70 = 762.73/x
  3. Step 3: Cross multiply
    1,127.90x = 1,690.70 × 762.73
  4. Step 4: Simplify right side
    1,127.90x = 1,289,547.61
  5. Step 5: Solve for x
    x = 1,289,547.61/1,127.90
  6. Step 6: Final answer
    x = 1,143.32

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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.