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Finding the Fourth Proportional to 147.13, 219.62 and 128.01

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Solution

The fourth proportional to 147.13, 219.62 and 128.01 is: 191.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.13 : 219.62 = 128.01 : x
  2. Step 2: Convert to fraction form
    147.13/219.62 = 128.01/x
  3. Step 3: Cross multiply
    147.13x = 219.62 × 128.01
  4. Step 4: Simplify right side
    147.13x = 28,113.56
  5. Step 5: Solve for x
    x = 28,113.56/147.13
  6. Step 6: Final answer
    x = 191.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.