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Finding the Fourth Proportional to 18,970.20, 28,486.98 and 12,770.10

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Solution

The fourth proportional to 18,970.20, 28,486.98 and 12,770.10 is: 19,176.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.20 : 28,486.98 = 12,770.10 : x
  2. Step 2: Convert to fraction form
    18,970.20/28,486.98 = 12,770.10/x
  3. Step 3: Cross multiply
    18,970.20x = 28,486.98 × 12,770.10
  4. Step 4: Simplify right side
    18,970.20x = 363,781,583.30
  5. Step 5: Solve for x
    x = 363,781,583.30/18,970.20
  6. Step 6: Final answer
    x = 19,176.48

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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.