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Finding the Fourth Proportional to 28,340.64, 42,512.70 and 8,620.65

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Solution

The fourth proportional to 28,340.64, 42,512.70 and 8,620.65 is: 12,931.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,340.64 : 42,512.70 = 8,620.65 : x
  2. Step 2: Convert to fraction form
    28,340.64/42,512.70 = 8,620.65/x
  3. Step 3: Cross multiply
    28,340.64x = 42,512.70 × 8,620.65
  4. Step 4: Simplify right side
    28,340.64x = 366,487,107.26
  5. Step 5: Solve for x
    x = 366,487,107.26/28,340.64
  6. Step 6: Final answer
    x = 12,931.50

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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.