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Finding the Fourth Proportional to 816.72, 1,220.16 and 651.12

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Solution

The fourth proportional to 816.72, 1,220.16 and 651.12 is: 972.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.72 : 1,220.16 = 651.12 : x
  2. Step 2: Convert to fraction form
    816.72/1,220.16 = 651.12/x
  3. Step 3: Cross multiply
    816.72x = 1,220.16 × 651.12
  4. Step 4: Simplify right side
    816.72x = 794,470.58
  5. Step 5: Solve for x
    x = 794,470.58/816.72
  6. Step 6: Final answer
    x = 972.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.