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Finding the Fourth Proportional to 139,419.70, 209,129.55 and 126,953.80

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Solution

The fourth proportional to 139,419.70, 209,129.55 and 126,953.80 is: 190,430.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,419.70 : 209,129.55 = 126,953.80 : x
  2. Step 2: Convert to fraction form
    139,419.70/209,129.55 = 126,953.80/x
  3. Step 3: Cross multiply
    139,419.70x = 209,129.55 × 126,953.80
  4. Step 4: Simplify right side
    139,419.70x = 26,549,791,064.79
  5. Step 5: Solve for x
    x = 26,549,791,064.79/139,419.70
  6. Step 6: Final answer
    x = 190,430.70

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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.