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Finding the Fourth Proportional to 43.42, 64.70 and 42.94

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Solution

The fourth proportional to 43.42, 64.70 and 42.94 is: 63.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.42 : 64.70 = 42.94 : x
  2. Step 2: Convert to fraction form
    43.42/64.70 = 42.94/x
  3. Step 3: Cross multiply
    43.42x = 64.70 × 42.94
  4. Step 4: Simplify right side
    43.42x = 2,778.22
  5. Step 5: Solve for x
    x = 2,778.22/43.42
  6. Step 6: Final answer
    x = 63.98

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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.