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Finding the Fourth Proportional to 58,205.60, 87,286.80 and 20,751.20

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Solution

The fourth proportional to 58,205.60, 87,286.80 and 20,751.20 is: 31,119.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,205.60 : 87,286.80 = 20,751.20 : x
  2. Step 2: Convert to fraction form
    58,205.60/87,286.80 = 20,751.20/x
  3. Step 3: Cross multiply
    58,205.60x = 87,286.80 × 20,751.20
  4. Step 4: Simplify right side
    58,205.60x = 1,811,305,844.16
  5. Step 5: Solve for x
    x = 1,811,305,844.16/58,205.60
  6. Step 6: Final answer
    x = 31,119.10

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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.