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Finding the Fourth Proportional to 28,479.84, 42,724.68 and 12,690.48

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Solution

The fourth proportional to 28,479.84, 42,724.68 and 12,690.48 is: 19,037.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.84 : 42,724.68 = 12,690.48 : x
  2. Step 2: Convert to fraction form
    28,479.84/42,724.68 = 12,690.48/x
  3. Step 3: Cross multiply
    28,479.84x = 42,724.68 × 12,690.48
  4. Step 4: Simplify right side
    28,479.84x = 542,196,697.05
  5. Step 5: Solve for x
    x = 542,196,697.05/28,479.84
  6. Step 6: Final answer
    x = 19,037.91

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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.