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Finding the Fourth Proportional to 57,719.60, 86,595.60 and 28,138.40

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Solution

The fourth proportional to 57,719.60, 86,595.60 and 28,138.40 is: 42,215.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,719.60 : 86,595.60 = 28,138.40 : x
  2. Step 2: Convert to fraction form
    57,719.60/86,595.60 = 28,138.40/x
  3. Step 3: Cross multiply
    57,719.60x = 86,595.60 × 28,138.40
  4. Step 4: Simplify right side
    57,719.60x = 2,436,661,631.04
  5. Step 5: Solve for x
    x = 2,436,661,631.04/57,719.60
  6. Step 6: Final answer
    x = 42,215.50

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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.