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Finding the Fourth Proportional to 67.30, 92.85 and 42.40

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Solution

The fourth proportional to 67.30, 92.85 and 42.40 is: 58.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.30 : 92.85 = 42.40 : x
  2. Step 2: Convert to fraction form
    67.30/92.85 = 42.40/x
  3. Step 3: Cross multiply
    67.30x = 92.85 × 42.40
  4. Step 4: Simplify right side
    67.30x = 3,936.84
  5. Step 5: Solve for x
    x = 3,936.84/67.30
  6. Step 6: Final answer
    x = 58.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.