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Finding the Fourth Proportional to 139,020.30, 208,530.45 and 121,524.30

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Solution

The fourth proportional to 139,020.30, 208,530.45 and 121,524.30 is: 182,286.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,020.30 : 208,530.45 = 121,524.30 : x
  2. Step 2: Convert to fraction form
    139,020.30/208,530.45 = 121,524.30/x
  3. Step 3: Cross multiply
    139,020.30x = 208,530.45 × 121,524.30
  4. Step 4: Simplify right side
    139,020.30x = 25,341,516,964.94
  5. Step 5: Solve for x
    x = 25,341,516,964.94/139,020.30
  6. Step 6: Final answer
    x = 182,286.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.