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Finding the Fourth Proportional to 127.90, 176.70 and 100.18

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Solution

The fourth proportional to 127.90, 176.70 and 100.18 is: 138.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.90 : 176.70 = 100.18 : x
  2. Step 2: Convert to fraction form
    127.90/176.70 = 100.18/x
  3. Step 3: Cross multiply
    127.90x = 176.70 × 100.18
  4. Step 4: Simplify right side
    127.90x = 17,701.81
  5. Step 5: Solve for x
    x = 17,701.81/127.90
  6. Step 6: Final answer
    x = 138.40

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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.