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Finding the Fourth Proportional to 721.54, 1,076.15 and 612.57

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Solution

The fourth proportional to 721.54, 1,076.15 and 612.57 is: 913.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.54 : 1,076.15 = 612.57 : x
  2. Step 2: Convert to fraction form
    721.54/1,076.15 = 612.57/x
  3. Step 3: Cross multiply
    721.54x = 1,076.15 × 612.57
  4. Step 4: Simplify right side
    721.54x = 659,222.77
  5. Step 5: Solve for x
    x = 659,222.77/721.54
  6. Step 6: Final answer
    x = 913.63

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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.