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Finding the Fourth Proportional to 28,340.40, 42,512.20 and 8,619.60

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Solution

The fourth proportional to 28,340.40, 42,512.20 and 8,619.60 is: 12,929.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,340.40 : 42,512.20 = 8,619.60 : x
  2. Step 2: Convert to fraction form
    28,340.40/42,512.20 = 8,619.60/x
  3. Step 3: Cross multiply
    28,340.40x = 42,512.20 × 8,619.60
  4. Step 4: Simplify right side
    28,340.40x = 366,438,159.12
  5. Step 5: Solve for x
    x = 366,438,159.12/28,340.40
  6. Step 6: Final answer
    x = 12,929.89

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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.