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Finding the Fourth Proportional to 86,713.80, 130,043.70 and 34,139.40

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Solution

The fourth proportional to 86,713.80, 130,043.70 and 34,139.40 is: 51,198.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,713.80 : 130,043.70 = 34,139.40 : x
  2. Step 2: Convert to fraction form
    86,713.80/130,043.70 = 34,139.40/x
  3. Step 3: Cross multiply
    86,713.80x = 130,043.70 × 34,139.40
  4. Step 4: Simplify right side
    86,713.80x = 4,439,613,891.78
  5. Step 5: Solve for x
    x = 4,439,613,891.78/86,713.80
  6. Step 6: Final answer
    x = 51,198.47

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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.