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Finding the Fourth Proportional to 86.74, 130.12 and 48.20

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Solution

The fourth proportional to 86.74, 130.12 and 48.20 is: 72.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.74 : 130.12 = 48.20 : x
  2. Step 2: Convert to fraction form
    86.74/130.12 = 48.20/x
  3. Step 3: Cross multiply
    86.74x = 130.12 × 48.20
  4. Step 4: Simplify right side
    86.74x = 6,271.78
  5. Step 5: Solve for x
    x = 6,271.78/86.74
  6. Step 6: Final answer
    x = 72.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.