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Finding the Fourth Proportional to 28,151.40, 42,222.24 and 17,128.92

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Solution

The fourth proportional to 28,151.40, 42,222.24 and 17,128.92 is: 25,690.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,151.40 : 42,222.24 = 17,128.92 : x
  2. Step 2: Convert to fraction form
    28,151.40/42,222.24 = 17,128.92/x
  3. Step 3: Cross multiply
    28,151.40x = 42,222.24 × 17,128.92
  4. Step 4: Simplify right side
    28,151.40x = 723,221,371.18
  5. Step 5: Solve for x
    x = 723,221,371.18/28,151.40
  6. Step 6: Final answer
    x = 25,690.42

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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.