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Finding the Fourth Proportional to 125.40, 163.20 and 125.40

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Solution

The fourth proportional to 125.40, 163.20 and 125.40 is: 163.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.40 : 163.20 = 125.40 : x
  2. Step 2: Convert to fraction form
    125.40/163.20 = 125.40/x
  3. Step 3: Cross multiply
    125.40x = 163.20 × 125.40
  4. Step 4: Simplify right side
    125.40x = 20,465.28
  5. Step 5: Solve for x
    x = 20,465.28/125.40
  6. Step 6: Final answer
    x = 163.20

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.