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Finding the Fourth Proportional to 760.75, 1,139.84 and 662.15

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Solution

The fourth proportional to 760.75, 1,139.84 and 662.15 is: 992.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.75 : 1,139.84 = 662.15 : x
  2. Step 2: Convert to fraction form
    760.75/1,139.84 = 662.15/x
  3. Step 3: Cross multiply
    760.75x = 1,139.84 × 662.15
  4. Step 4: Simplify right side
    760.75x = 754,745.06
  5. Step 5: Solve for x
    x = 754,745.06/760.75
  6. Step 6: Final answer
    x = 992.11

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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.