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Finding the Fourth Proportional to 28,480.80, 42,720.80 and 12,898.40

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Solution

The fourth proportional to 28,480.80, 42,720.80 and 12,898.40 is: 19,347.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,480.80 : 42,720.80 = 12,898.40 : x
  2. Step 2: Convert to fraction form
    28,480.80/42,720.80 = 12,898.40/x
  3. Step 3: Cross multiply
    28,480.80x = 42,720.80 × 12,898.40
  4. Step 4: Simplify right side
    28,480.80x = 551,029,966.72
  5. Step 5: Solve for x
    x = 551,029,966.72/28,480.80
  6. Step 6: Final answer
    x = 19,347.42

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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.