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Finding the Fourth Proportional to 20,959.44, 28,928.52 and 12,008.40

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Solution

The fourth proportional to 20,959.44, 28,928.52 and 12,008.40 is: 16,574.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.44 : 28,928.52 = 12,008.40 : x
  2. Step 2: Convert to fraction form
    20,959.44/28,928.52 = 12,008.40/x
  3. Step 3: Cross multiply
    20,959.44x = 28,928.52 × 12,008.40
  4. Step 4: Simplify right side
    20,959.44x = 347,385,239.57
  5. Step 5: Solve for x
    x = 347,385,239.57/20,959.44
  6. Step 6: Final answer
    x = 16,574.17

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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.