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Finding the Fourth Proportional to 48.79, 67.40 and 40.69

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Solution

The fourth proportional to 48.79, 67.40 and 40.69 is: 56.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.79 : 67.40 = 40.69 : x
  2. Step 2: Convert to fraction form
    48.79/67.40 = 40.69/x
  3. Step 3: Cross multiply
    48.79x = 67.40 × 40.69
  4. Step 4: Simplify right side
    48.79x = 2,742.51
  5. Step 5: Solve for x
    x = 2,742.51/48.79
  6. Step 6: Final answer
    x = 56.21

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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.