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Finding the Fourth Proportional to 43.13, 64.31 and 42.36

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Solution

The fourth proportional to 43.13, 64.31 and 42.36 is: 63.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.13 : 64.31 = 42.36 : x
  2. Step 2: Convert to fraction form
    43.13/64.31 = 42.36/x
  3. Step 3: Cross multiply
    43.13x = 64.31 × 42.36
  4. Step 4: Simplify right side
    43.13x = 2,724.01
  5. Step 5: Solve for x
    x = 2,724.01/43.13
  6. Step 6: Final answer
    x = 63.16

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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.