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Finding the Fourth Proportional to 753.94, 1,128.57 and 615.70

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Solution

The fourth proportional to 753.94, 1,128.57 and 615.70 is: 921.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.94 : 1,128.57 = 615.70 : x
  2. Step 2: Convert to fraction form
    753.94/1,128.57 = 615.70/x
  3. Step 3: Cross multiply
    753.94x = 1,128.57 × 615.70
  4. Step 4: Simplify right side
    753.94x = 694,860.55
  5. Step 5: Solve for x
    x = 694,860.55/753.94
  6. Step 6: Final answer
    x = 921.64

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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.