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Finding the Fourth Proportional to 722.12, 1,084.56 and 665.24

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Solution

The fourth proportional to 722.12, 1,084.56 and 665.24 is: 999.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.12 : 1,084.56 = 665.24 : x
  2. Step 2: Convert to fraction form
    722.12/1,084.56 = 665.24/x
  3. Step 3: Cross multiply
    722.12x = 1,084.56 × 665.24
  4. Step 4: Simplify right side
    722.12x = 721,492.69
  5. Step 5: Solve for x
    x = 721,492.69/722.12
  6. Step 6: Final answer
    x = 999.13

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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.