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Finding the Fourth Proportional to 129,639.80, 194,070.90 and 77,022.20

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Solution

The fourth proportional to 129,639.80, 194,070.90 and 77,022.20 is: 115,302.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,639.80 : 194,070.90 = 77,022.20 : x
  2. Step 2: Convert to fraction form
    129,639.80/194,070.90 = 77,022.20/x
  3. Step 3: Cross multiply
    129,639.80x = 194,070.90 × 77,022.20
  4. Step 4: Simplify right side
    129,639.80x = 14,947,767,673.98
  5. Step 5: Solve for x
    x = 14,947,767,673.98/129,639.80
  6. Step 6: Final answer
    x = 115,302.30

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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.