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Finding the Fourth Proportional to 147.15, 202.81 and 113.45

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Solution

The fourth proportional to 147.15, 202.81 and 113.45 is: 156.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.15 : 202.81 = 113.45 : x
  2. Step 2: Convert to fraction form
    147.15/202.81 = 113.45/x
  3. Step 3: Cross multiply
    147.15x = 202.81 × 113.45
  4. Step 4: Simplify right side
    147.15x = 23,008.79
  5. Step 5: Solve for x
    x = 23,008.79/147.15
  6. Step 6: Final answer
    x = 156.36

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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.