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Finding the Fourth Proportional to 19,008.80, 28,513.20 and 12,442.40

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Solution

The fourth proportional to 19,008.80, 28,513.20 and 12,442.40 is: 18,663.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,008.80 : 28,513.20 = 12,442.40 : x
  2. Step 2: Convert to fraction form
    19,008.80/28,513.20 = 12,442.40/x
  3. Step 3: Cross multiply
    19,008.80x = 28,513.20 × 12,442.40
  4. Step 4: Simplify right side
    19,008.80x = 354,772,639.68
  5. Step 5: Solve for x
    x = 354,772,639.68/19,008.80
  6. Step 6: Final answer
    x = 18,663.60

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Similar ratio
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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.