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Finding the Fourth Proportional to 80,085.95, 120,130.09 and 20,921.63

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Solution

The fourth proportional to 80,085.95, 120,130.09 and 20,921.63 is: 31,382.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,085.95 : 120,130.09 = 20,921.63 : x
  2. Step 2: Convert to fraction form
    80,085.95/120,130.09 = 20,921.63/x
  3. Step 3: Cross multiply
    80,085.95x = 120,130.09 × 20,921.63
  4. Step 4: Simplify right side
    80,085.95x = 2,513,316,641.89
  5. Step 5: Solve for x
    x = 2,513,316,641.89/80,085.95
  6. Step 6: Final answer
    x = 31,382.74

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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.