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Finding the Fourth Proportional to 28,479.60, 42,719.64 and 12,878.88

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Solution

The fourth proportional to 28,479.60, 42,719.64 and 12,878.88 is: 19,318.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.60 : 42,719.64 = 12,878.88 : x
  2. Step 2: Convert to fraction form
    28,479.60/42,719.64 = 12,878.88/x
  3. Step 3: Cross multiply
    28,479.60x = 42,719.64 × 12,878.88
  4. Step 4: Simplify right side
    28,479.60x = 550,181,117.20
  5. Step 5: Solve for x
    x = 550,181,117.20/28,479.60
  6. Step 6: Final answer
    x = 19,318.43

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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.