Home / 28,019.60-42,029.40-12,438.80

Finding the Fourth Proportional to 28,019.60, 42,029.40 and 12,438.80

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Solution

The fourth proportional to 28,019.60, 42,029.40 and 12,438.80 is: 18,658.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,019.60 : 42,029.40 = 12,438.80 : x
  2. Step 2: Convert to fraction form
    28,019.60/42,029.40 = 12,438.80/x
  3. Step 3: Cross multiply
    28,019.60x = 42,029.40 × 12,438.80
  4. Step 4: Simplify right side
    28,019.60x = 522,795,300.72
  5. Step 5: Solve for x
    x = 522,795,300.72/28,019.60
  6. Step 6: Final answer
    x = 18,658.20

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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.