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Finding the Fourth Proportional to 722.56, 1,081.50 and 478.48

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Solution

The fourth proportional to 722.56, 1,081.50 and 478.48 is: 716.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.56 : 1,081.50 = 478.48 : x
  2. Step 2: Convert to fraction form
    722.56/1,081.50 = 478.48/x
  3. Step 3: Cross multiply
    722.56x = 1,081.50 × 478.48
  4. Step 4: Simplify right side
    722.56x = 517,476.12
  5. Step 5: Solve for x
    x = 517,476.12/722.56
  6. Step 6: Final answer
    x = 716.17

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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.