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Finding the Fourth Proportional to 53.57, 80.05 and 40.66

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Solution

The fourth proportional to 53.57, 80.05 and 40.66 is: 60.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.57 : 80.05 = 40.66 : x
  2. Step 2: Convert to fraction form
    53.57/80.05 = 40.66/x
  3. Step 3: Cross multiply
    53.57x = 80.05 × 40.66
  4. Step 4: Simplify right side
    53.57x = 3,254.83
  5. Step 5: Solve for x
    x = 3,254.83/53.57
  6. Step 6: Final answer
    x = 60.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.