Home / 28,129.80-42,168.30-10,611.40

Finding the Fourth Proportional to 28,129.80, 42,168.30 and 10,611.40

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Solution

The fourth proportional to 28,129.80, 42,168.30 and 10,611.40 is: 15,907.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129.80 : 42,168.30 = 10,611.40 : x
  2. Step 2: Convert to fraction form
    28,129.80/42,168.30 = 10,611.40/x
  3. Step 3: Cross multiply
    28,129.80x = 42,168.30 × 10,611.40
  4. Step 4: Simplify right side
    28,129.80x = 447,464,698.62
  5. Step 5: Solve for x
    x = 447,464,698.62/28,129.80
  6. Step 6: Final answer
    x = 15,907.14

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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.