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Finding the Fourth Proportional to 147.06, 220.69 and 85.30

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Solution

The fourth proportional to 147.06, 220.69 and 85.30 is: 128.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.06 : 220.69 = 85.30 : x
  2. Step 2: Convert to fraction form
    147.06/220.69 = 85.30/x
  3. Step 3: Cross multiply
    147.06x = 220.69 × 85.30
  4. Step 4: Simplify right side
    147.06x = 18,824.86
  5. Step 5: Solve for x
    x = 18,824.86/147.06
  6. Step 6: Final answer
    x = 128.01

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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.