Home / 28,429.20-42,643.80-15,987.60

Finding the Fourth Proportional to 28,429.20, 42,643.80 and 15,987.60

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Solution

The fourth proportional to 28,429.20, 42,643.80 and 15,987.60 is: 23,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,429.20 : 42,643.80 = 15,987.60 : x
  2. Step 2: Convert to fraction form
    28,429.20/42,643.80 = 15,987.60/x
  3. Step 3: Cross multiply
    28,429.20x = 42,643.80 × 15,987.60
  4. Step 4: Simplify right side
    28,429.20x = 681,772,016.88
  5. Step 5: Solve for x
    x = 681,772,016.88/28,429.20
  6. Step 6: Final answer
    x = 23,981.40

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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.