Home / 20,870.52-28,801.32-11,439.28

Finding the Fourth Proportional to 20,870.52, 28,801.32 and 11,439.28

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Solution

The fourth proportional to 20,870.52, 28,801.32 and 11,439.28 is: 15,786.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.52 : 28,801.32 = 11,439.28 : x
  2. Step 2: Convert to fraction form
    20,870.52/28,801.32 = 11,439.28/x
  3. Step 3: Cross multiply
    20,870.52x = 28,801.32 × 11,439.28
  4. Step 4: Simplify right side
    20,870.52x = 329,466,363.85
  5. Step 5: Solve for x
    x = 329,466,363.85/20,870.52
  6. Step 6: Final answer
    x = 15,786.21

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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.