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Finding the Fourth Proportional to 42.61, 64.27 and 40.11

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Solution

The fourth proportional to 42.61, 64.27 and 40.11 is: 60.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.61 : 64.27 = 40.11 : x
  2. Step 2: Convert to fraction form
    42.61/64.27 = 40.11/x
  3. Step 3: Cross multiply
    42.61x = 64.27 × 40.11
  4. Step 4: Simplify right side
    42.61x = 2,577.67
  5. Step 5: Solve for x
    x = 2,577.67/42.61
  6. Step 6: Final answer
    x = 60.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.