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Finding the Fourth Proportional to 147.47, 203.51 and 81.98

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Solution

The fourth proportional to 147.47, 203.51 and 81.98 is: 113.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.47 : 203.51 = 81.98 : x
  2. Step 2: Convert to fraction form
    147.47/203.51 = 81.98/x
  3. Step 3: Cross multiply
    147.47x = 203.51 × 81.98
  4. Step 4: Simplify right side
    147.47x = 16,682.32
  5. Step 5: Solve for x
    x = 16,682.32/147.47
  6. Step 6: Final answer
    x = 113.13

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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.