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Finding the Fourth Proportional to 79,971.30, 119,957.10 and 20,806.87

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Solution

The fourth proportional to 79,971.30, 119,957.10 and 20,806.87 is: 31,210.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,971.30 : 119,957.10 = 20,806.87 : x
  2. Step 2: Convert to fraction form
    79,971.30/119,957.10 = 20,806.87/x
  3. Step 3: Cross multiply
    79,971.30x = 119,957.10 × 20,806.87
  4. Step 4: Simplify right side
    79,971.30x = 2,495,931,785.28
  5. Step 5: Solve for x
    x = 2,495,931,785.28/79,971.30
  6. Step 6: Final answer
    x = 31,210.34

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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.