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Finding the Fourth Proportional to 711.22, 1,069.26 and 657.76

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Solution

The fourth proportional to 711.22, 1,069.26 and 657.76 is: 988.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.22 : 1,069.26 = 657.76 : x
  2. Step 2: Convert to fraction form
    711.22/1,069.26 = 657.76/x
  3. Step 3: Cross multiply
    711.22x = 1,069.26 × 657.76
  4. Step 4: Simplify right side
    711.22x = 703,316.46
  5. Step 5: Solve for x
    x = 703,316.46/711.22
  6. Step 6: Final answer
    x = 988.89

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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.