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Finding the Fourth Proportional to 86,620.75, 129,931.13 and 20,956.75

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Solution

The fourth proportional to 86,620.75, 129,931.13 and 20,956.75 is: 31,435.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,620.75 : 129,931.13 = 20,956.75 : x
  2. Step 2: Convert to fraction form
    86,620.75/129,931.13 = 20,956.75/x
  3. Step 3: Cross multiply
    86,620.75x = 129,931.13 × 20,956.75
  4. Step 4: Simplify right side
    86,620.75x = 2,722,934,208.63
  5. Step 5: Solve for x
    x = 2,722,934,208.63/86,620.75
  6. Step 6: Final answer
    x = 31,435.13

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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.