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Finding the Fourth Proportional to 43.08, 64.47 and 42.60

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Solution

The fourth proportional to 43.08, 64.47 and 42.60 is: 63.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.08 : 64.47 = 42.60 : x
  2. Step 2: Convert to fraction form
    43.08/64.47 = 42.60/x
  3. Step 3: Cross multiply
    43.08x = 64.47 × 42.60
  4. Step 4: Simplify right side
    43.08x = 2,746.42
  5. Step 5: Solve for x
    x = 2,746.42/43.08
  6. Step 6: Final answer
    x = 63.75

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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.