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Finding the Fourth Proportional to 86,713.20, 130,901.40 and 85,838.40

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Solution

The fourth proportional to 86,713.20, 130,901.40 and 85,838.40 is: 129,580.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,713.20 : 130,901.40 = 85,838.40 : x
  2. Step 2: Convert to fraction form
    86,713.20/130,901.40 = 85,838.40/x
  3. Step 3: Cross multiply
    86,713.20x = 130,901.40 × 85,838.40
  4. Step 4: Simplify right side
    86,713.20x = 11,236,366,733.76
  5. Step 5: Solve for x
    x = 11,236,366,733.76/86,713.20
  6. Step 6: Final answer
    x = 129,580.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.