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Finding the Fourth Proportional to 62.79, 86.70 and 48.21

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Solution

The fourth proportional to 62.79, 86.70 and 48.21 is: 66.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.79 : 86.70 = 48.21 : x
  2. Step 2: Convert to fraction form
    62.79/86.70 = 48.21/x
  3. Step 3: Cross multiply
    62.79x = 86.70 × 48.21
  4. Step 4: Simplify right side
    62.79x = 4,179.81
  5. Step 5: Solve for x
    x = 4,179.81/62.79
  6. Step 6: Final answer
    x = 66.57

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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.