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Finding the Fourth Proportional to 125.40, 172.97 and 100.83

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Solution

The fourth proportional to 125.40, 172.97 and 100.83 is: 139.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.40 : 172.97 = 100.83 : x
  2. Step 2: Convert to fraction form
    125.40/172.97 = 100.83/x
  3. Step 3: Cross multiply
    125.40x = 172.97 × 100.83
  4. Step 4: Simplify right side
    125.40x = 17,440.06
  5. Step 5: Solve for x
    x = 17,440.06/125.40
  6. Step 6: Final answer
    x = 139.08

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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.