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Finding the Fourth Proportional to 722.16, 1,081.44 and 433.80

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Solution

The fourth proportional to 722.16, 1,081.44 and 433.80 is: 649.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.16 : 1,081.44 = 433.80 : x
  2. Step 2: Convert to fraction form
    722.16/1,081.44 = 433.80/x
  3. Step 3: Cross multiply
    722.16x = 1,081.44 × 433.80
  4. Step 4: Simplify right side
    722.16x = 469,128.67
  5. Step 5: Solve for x
    x = 469,128.67/722.16
  6. Step 6: Final answer
    x = 649.62

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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.