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Finding the Fourth Proportional to 717.51, 1,076.61 and 620.61

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Solution

The fourth proportional to 717.51, 1,076.61 and 620.61 is: 931.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.51 : 1,076.61 = 620.61 : x
  2. Step 2: Convert to fraction form
    717.51/1,076.61 = 620.61/x
  3. Step 3: Cross multiply
    717.51x = 1,076.61 × 620.61
  4. Step 4: Simplify right side
    717.51x = 668,154.93
  5. Step 5: Solve for x
    x = 668,154.93/717.51
  6. Step 6: Final answer
    x = 931.21

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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.