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Finding the Fourth Proportional to 762.75, 1,053.59 and 615.93

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Solution

The fourth proportional to 762.75, 1,053.59 and 615.93 is: 850.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.75 : 1,053.59 = 615.93 : x
  2. Step 2: Convert to fraction form
    762.75/1,053.59 = 615.93/x
  3. Step 3: Cross multiply
    762.75x = 1,053.59 × 615.93
  4. Step 4: Simplify right side
    762.75x = 648,934.61
  5. Step 5: Solve for x
    x = 648,934.61/762.75
  6. Step 6: Final answer
    x = 850.78

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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.