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Finding the Fourth Proportional to 764.74, 1,053.49 and 717.76

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Solution

The fourth proportional to 764.74, 1,053.49 and 717.76 is: 988.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.74 : 1,053.49 = 717.76 : x
  2. Step 2: Convert to fraction form
    764.74/1,053.49 = 717.76/x
  3. Step 3: Cross multiply
    764.74x = 1,053.49 × 717.76
  4. Step 4: Simplify right side
    764.74x = 756,144.13
  5. Step 5: Solve for x
    x = 756,144.13/764.74
  6. Step 6: Final answer
    x = 988.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.