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Finding the Fourth Proportional to 79,690.68, 109,936.20 and 51,405.48

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Solution

The fourth proportional to 79,690.68, 109,936.20 and 51,405.48 is: 70,915.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,690.68 : 109,936.20 = 51,405.48 : x
  2. Step 2: Convert to fraction form
    79,690.68/109,936.20 = 51,405.48/x
  3. Step 3: Cross multiply
    79,690.68x = 109,936.20 × 51,405.48
  4. Step 4: Simplify right side
    79,690.68x = 5,651,323,130.38
  5. Step 5: Solve for x
    x = 5,651,323,130.38/79,690.68
  6. Step 6: Final answer
    x = 70,915.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.