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Finding the Fourth Proportional to 129,871.40, 194,807.10 and 74,421.80

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Solution

The fourth proportional to 129,871.40, 194,807.10 and 74,421.80 is: 111,632.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,871.40 : 194,807.10 = 74,421.80 : x
  2. Step 2: Convert to fraction form
    129,871.40/194,807.10 = 74,421.80/x
  3. Step 3: Cross multiply
    129,871.40x = 194,807.10 × 74,421.80
  4. Step 4: Simplify right side
    129,871.40x = 14,497,895,034.78
  5. Step 5: Solve for x
    x = 14,497,895,034.78/129,871.40
  6. Step 6: Final answer
    x = 111,632.70

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1.5x scale

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.