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Finding the Fourth Proportional to 72,139.56, 108,198.41 and 25,381.50

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Solution

The fourth proportional to 72,139.56, 108,198.41 and 25,381.50 is: 38,068.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,139.56 : 108,198.41 = 25,381.50 : x
  2. Step 2: Convert to fraction form
    72,139.56/108,198.41 = 25,381.50/x
  3. Step 3: Cross multiply
    72,139.56x = 108,198.41 × 25,381.50
  4. Step 4: Simplify right side
    72,139.56x = 2,746,237,816.51
  5. Step 5: Solve for x
    x = 2,746,237,816.51/72,139.56
  6. Step 6: Final answer
    x = 38,068.40

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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.