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Finding the Fourth Proportional to 48.86, 67.45 and 31.40

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Solution

The fourth proportional to 48.86, 67.45 and 31.40 is: 43.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.86 : 67.45 = 31.40 : x
  2. Step 2: Convert to fraction form
    48.86/67.45 = 31.40/x
  3. Step 3: Cross multiply
    48.86x = 67.45 × 31.40
  4. Step 4: Simplify right side
    48.86x = 2,117.59
  5. Step 5: Solve for x
    x = 2,117.59/48.86
  6. Step 6: Final answer
    x = 43.34

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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.