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Finding the Fourth Proportional to 42,482.80, 63,724.20 and 12,899.20

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Solution

The fourth proportional to 42,482.80, 63,724.20 and 12,899.20 is: 19,348.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,482.80 : 63,724.20 = 12,899.20 : x
  2. Step 2: Convert to fraction form
    42,482.80/63,724.20 = 12,899.20/x
  3. Step 3: Cross multiply
    42,482.80x = 63,724.20 × 12,899.20
  4. Step 4: Simplify right side
    42,482.80x = 821,991,200.64
  5. Step 5: Solve for x
    x = 821,991,200.64/42,482.80
  6. Step 6: Final answer
    x = 19,348.80

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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.