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Finding the Fourth Proportional to 19,870.80, 29,806.20 and 12,872.40

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Solution

The fourth proportional to 19,870.80, 29,806.20 and 12,872.40 is: 19,308.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,870.80 : 29,806.20 = 12,872.40 : x
  2. Step 2: Convert to fraction form
    19,870.80/29,806.20 = 12,872.40/x
  3. Step 3: Cross multiply
    19,870.80x = 29,806.20 × 12,872.40
  4. Step 4: Simplify right side
    19,870.80x = 383,677,328.88
  5. Step 5: Solve for x
    x = 383,677,328.88/19,870.80
  6. Step 6: Final answer
    x = 19,308.60

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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.