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Finding the Fourth Proportional to 86,811.60, 130,217.44 and 31,394.64

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Solution

The fourth proportional to 86,811.60, 130,217.44 and 31,394.64 is: 47,091.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,811.60 : 130,217.44 = 31,394.64 : x
  2. Step 2: Convert to fraction form
    86,811.60/130,217.44 = 31,394.64/x
  3. Step 3: Cross multiply
    86,811.60x = 130,217.44 × 31,394.64
  4. Step 4: Simplify right side
    86,811.60x = 4,088,129,650.52
  5. Step 5: Solve for x
    x = 4,088,129,650.52/86,811.60
  6. Step 6: Final answer
    x = 47,091.97

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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.