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Finding the Fourth Proportional to 28,443.60, 42,678.20 and 12,853.20

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Solution

The fourth proportional to 28,443.60, 42,678.20 and 12,853.20 is: 19,285.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,443.60 : 42,678.20 = 12,853.20 : x
  2. Step 2: Convert to fraction form
    28,443.60/42,678.20 = 12,853.20/x
  3. Step 3: Cross multiply
    28,443.60x = 42,678.20 × 12,853.20
  4. Step 4: Simplify right side
    28,443.60x = 548,551,440.24
  5. Step 5: Solve for x
    x = 548,551,440.24/28,443.60
  6. Step 6: Final answer
    x = 19,285.58

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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.