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Finding the Fourth Proportional to 526.67, 726.87 and 305.61

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Solution

The fourth proportional to 526.67, 726.87 and 305.61 is: 421.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.67 : 726.87 = 305.61 : x
  2. Step 2: Convert to fraction form
    526.67/726.87 = 305.61/x
  3. Step 3: Cross multiply
    526.67x = 726.87 × 305.61
  4. Step 4: Simplify right side
    526.67x = 222,137.16
  5. Step 5: Solve for x
    x = 222,137.16/526.67
  6. Step 6: Final answer
    x = 421.78

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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.