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Finding the Fourth Proportional to 20,439, 28,205.58 and 11,488.02

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Solution

The fourth proportional to 20,439, 28,205.58 and 11,488.02 is: 15,853.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439 : 28,205.58 = 11,488.02 : x
  2. Step 2: Convert to fraction form
    20,439/28,205.58 = 11,488.02/x
  3. Step 3: Cross multiply
    20,439x = 28,205.58 × 11,488.02
  4. Step 4: Simplify right side
    20,439x = 324,026,267.15
  5. Step 5: Solve for x
    x = 324,026,267.15/20,439
  6. Step 6: Final answer
    x = 15,853.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.