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Finding the Fourth Proportional to 84,309, 126,470.79 and 21,979.50

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Solution

The fourth proportional to 84,309, 126,470.79 and 21,979.50 is: 32,971.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,309 : 126,470.79 = 21,979.50 : x
  2. Step 2: Convert to fraction form
    84,309/126,470.79 = 21,979.50/x
  3. Step 3: Cross multiply
    84,309x = 126,470.79 × 21,979.50
  4. Step 4: Simplify right side
    84,309x = 2,779,764,728.81
  5. Step 5: Solve for x
    x = 2,779,764,728.81/84,309
  6. Step 6: Final answer
    x = 32,971.15

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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.