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Finding the Fourth Proportional to 42.95, 64.43 and 15.90

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Solution

The fourth proportional to 42.95, 64.43 and 15.90 is: 23.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.95 : 64.43 = 15.90 : x
  2. Step 2: Convert to fraction form
    42.95/64.43 = 15.90/x
  3. Step 3: Cross multiply
    42.95x = 64.43 × 15.90
  4. Step 4: Simplify right side
    42.95x = 1,024.44
  5. Step 5: Solve for x
    x = 1,024.44/42.95
  6. Step 6: Final answer
    x = 23.85

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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.