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Finding the Fourth Proportional to 45.15, 67.40 and 43.08

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Solution

The fourth proportional to 45.15, 67.40 and 43.08 is: 64.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.15 : 67.40 = 43.08 : x
  2. Step 2: Convert to fraction form
    45.15/67.40 = 43.08/x
  3. Step 3: Cross multiply
    45.15x = 67.40 × 43.08
  4. Step 4: Simplify right side
    45.15x = 2,903.38
  5. Step 5: Solve for x
    x = 2,903.38/45.15
  6. Step 6: Final answer
    x = 64.31

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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.