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Finding the Fourth Proportional to 57,187.20, 85,780.80 and 53,979.60

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Solution

The fourth proportional to 57,187.20, 85,780.80 and 53,979.60 is: 80,969.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,187.20 : 85,780.80 = 53,979.60 : x
  2. Step 2: Convert to fraction form
    57,187.20/85,780.80 = 53,979.60/x
  3. Step 3: Cross multiply
    57,187.20x = 85,780.80 × 53,979.60
  4. Step 4: Simplify right side
    57,187.20x = 4,630,413,271.68
  5. Step 5: Solve for x
    x = 4,630,413,271.68/57,187.20
  6. Step 6: Final answer
    x = 80,969.40

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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.