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Finding the Fourth Proportional to 28,479.90, 42,721.05 and 9,772.82

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Solution

The fourth proportional to 28,479.90, 42,721.05 and 9,772.82 is: 14,659.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.90 : 42,721.05 = 9,772.82 : x
  2. Step 2: Convert to fraction form
    28,479.90/42,721.05 = 9,772.82/x
  3. Step 3: Cross multiply
    28,479.90x = 42,721.05 × 9,772.82
  4. Step 4: Simplify right side
    28,479.90x = 417,505,115.11
  5. Step 5: Solve for x
    x = 417,505,115.11/28,479.90
  6. Step 6: Final answer
    x = 14,659.64

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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.