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Finding the Fourth Proportional to 981, 1,471.50 and 707.22

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Solution

The fourth proportional to 981, 1,471.50 and 707.22 is: 1,060.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    981 : 1,471.50 = 707.22 : x
  2. Step 2: Convert to fraction form
    981/1,471.50 = 707.22/x
  3. Step 3: Cross multiply
    981x = 1,471.50 × 707.22
  4. Step 4: Simplify right side
    981x = 1,040,674.23
  5. Step 5: Solve for x
    x = 1,040,674.23/981
  6. Step 6: Final answer
    x = 1,060.83

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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.