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Finding the Fourth Proportional to 897.12, 1,239.60 and 722.16

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Solution

The fourth proportional to 897.12, 1,239.60 and 722.16 is: 997.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.12 : 1,239.60 = 722.16 : x
  2. Step 2: Convert to fraction form
    897.12/1,239.60 = 722.16/x
  3. Step 3: Cross multiply
    897.12x = 1,239.60 × 722.16
  4. Step 4: Simplify right side
    897.12x = 895,189.54
  5. Step 5: Solve for x
    x = 895,189.54/897.12
  6. Step 6: Final answer
    x = 997.85

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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.