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Finding the Fourth Proportional to 72,721.16, 109,081.89 and 20,130.80

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Solution

The fourth proportional to 72,721.16, 109,081.89 and 20,130.80 is: 30,196.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,721.16 : 109,081.89 = 20,130.80 : x
  2. Step 2: Convert to fraction form
    72,721.16/109,081.89 = 20,130.80/x
  3. Step 3: Cross multiply
    72,721.16x = 109,081.89 × 20,130.80
  4. Step 4: Simplify right side
    72,721.16x = 2,195,905,711.21
  5. Step 5: Solve for x
    x = 2,195,905,711.21/72,721.16
  6. Step 6: Final answer
    x = 30,196.24

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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.