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Finding the Fourth Proportional to 1,000.61, 1,379.80 and 722.17

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Solution

The fourth proportional to 1,000.61, 1,379.80 and 722.17 is: 995.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.61 : 1,379.80 = 722.17 : x
  2. Step 2: Convert to fraction form
    1,000.61/1,379.80 = 722.17/x
  3. Step 3: Cross multiply
    1,000.61x = 1,379.80 × 722.17
  4. Step 4: Simplify right side
    1,000.61x = 996,450.17
  5. Step 5: Solve for x
    x = 996,450.17/1,000.61
  6. Step 6: Final answer
    x = 995.84

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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.