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Finding the Fourth Proportional to 28,979.60, 43,458.60 and 20,188.40

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Solution

The fourth proportional to 28,979.60, 43,458.60 and 20,188.40 is: 30,275.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,979.60 : 43,458.60 = 20,188.40 : x
  2. Step 2: Convert to fraction form
    28,979.60/43,458.60 = 20,188.40/x
  3. Step 3: Cross multiply
    28,979.60x = 43,458.60 × 20,188.40
  4. Step 4: Simplify right side
    28,979.60x = 877,359,600.24
  5. Step 5: Solve for x
    x = 877,359,600.24/28,979.60
  6. Step 6: Final answer
    x = 30,275.08

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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.