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Finding the Fourth Proportional to 147.64, 203.79 and 100.99

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Solution

The fourth proportional to 147.64, 203.79 and 100.99 is: 139.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.64 : 203.79 = 100.99 : x
  2. Step 2: Convert to fraction form
    147.64/203.79 = 100.99/x
  3. Step 3: Cross multiply
    147.64x = 203.79 × 100.99
  4. Step 4: Simplify right side
    147.64x = 20,581.39
  5. Step 5: Solve for x
    x = 20,581.39/147.64
  6. Step 6: Final answer
    x = 139.40

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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.