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Finding the Fourth Proportional to 758.76, 1,138.14 and 615.48

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Solution

The fourth proportional to 758.76, 1,138.14 and 615.48 is: 923.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.76 : 1,138.14 = 615.48 : x
  2. Step 2: Convert to fraction form
    758.76/1,138.14 = 615.48/x
  3. Step 3: Cross multiply
    758.76x = 1,138.14 × 615.48
  4. Step 4: Simplify right side
    758.76x = 700,502.41
  5. Step 5: Solve for x
    x = 700,502.41/758.76
  6. Step 6: Final answer
    x = 923.22

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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.