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Finding the Fourth Proportional to 763.88, 1,139.45 and 751.32

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Solution

The fourth proportional to 763.88, 1,139.45 and 751.32 is: 1,120.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.88 : 1,139.45 = 751.32 : x
  2. Step 2: Convert to fraction form
    763.88/1,139.45 = 751.32/x
  3. Step 3: Cross multiply
    763.88x = 1,139.45 × 751.32
  4. Step 4: Simplify right side
    763.88x = 856,087.82
  5. Step 5: Solve for x
    x = 856,087.82/763.88
  6. Step 6: Final answer
    x = 1,120.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.