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Finding the Fourth Proportional to 20,870.44, 28,802.52 and 11,439

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Solution

The fourth proportional to 20,870.44, 28,802.52 and 11,439 is: 15,786.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.44 : 28,802.52 = 11,439 : x
  2. Step 2: Convert to fraction form
    20,870.44/28,802.52 = 11,439/x
  3. Step 3: Cross multiply
    20,870.44x = 28,802.52 × 11,439
  4. Step 4: Simplify right side
    20,870.44x = 329,472,026.28
  5. Step 5: Solve for x
    x = 329,472,026.28/20,870.44
  6. Step 6: Final answer
    x = 15,786.54

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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.