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Finding the Fourth Proportional to 79,915.77, 119,873.70 and 20,746.47

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Solution

The fourth proportional to 79,915.77, 119,873.70 and 20,746.47 is: 31,119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,915.77 : 119,873.70 = 20,746.47 : x
  2. Step 2: Convert to fraction form
    79,915.77/119,873.70 = 20,746.47/x
  3. Step 3: Cross multiply
    79,915.77x = 119,873.70 × 20,746.47
  4. Step 4: Simplify right side
    79,915.77x = 2,486,956,120.84
  5. Step 5: Solve for x
    x = 2,486,956,120.84/79,915.77
  6. Step 6: Final answer
    x = 31,119.72

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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.