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Finding the Fourth Proportional to 726.35, 1,002.45 and 615.65

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Solution

The fourth proportional to 726.35, 1,002.45 and 615.65 is: 849.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.35 : 1,002.45 = 615.65 : x
  2. Step 2: Convert to fraction form
    726.35/1,002.45 = 615.65/x
  3. Step 3: Cross multiply
    726.35x = 1,002.45 × 615.65
  4. Step 4: Simplify right side
    726.35x = 617,153.33
  5. Step 5: Solve for x
    x = 617,153.33/726.35
  6. Step 6: Final answer
    x = 849.67

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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.