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Finding the Fourth Proportional to 86,647.38, 129,823.20 and 47,133.96

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Solution

The fourth proportional to 86,647.38, 129,823.20 and 47,133.96 is: 70,620.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,647.38 : 129,823.20 = 47,133.96 : x
  2. Step 2: Convert to fraction form
    86,647.38/129,823.20 = 47,133.96/x
  3. Step 3: Cross multiply
    86,647.38x = 129,823.20 × 47,133.96
  4. Step 4: Simplify right side
    86,647.38x = 6,119,081,515.87
  5. Step 5: Solve for x
    x = 6,119,081,515.87/86,647.38
  6. Step 6: Final answer
    x = 70,620.50

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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.