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Finding the Fourth Proportional to 72,904.88, 109,357.38 and 20,315.76

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Solution

The fourth proportional to 72,904.88, 109,357.38 and 20,315.76 is: 30,473.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,904.88 : 109,357.38 = 20,315.76 : x
  2. Step 2: Convert to fraction form
    72,904.88/109,357.38 = 20,315.76/x
  3. Step 3: Cross multiply
    72,904.88x = 109,357.38 × 20,315.76
  4. Step 4: Simplify right side
    72,904.88x = 2,221,678,286.31
  5. Step 5: Solve for x
    x = 2,221,678,286.31/72,904.88
  6. Step 6: Final answer
    x = 30,473.66

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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.