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Finding the Fourth Proportional to 86,023.67, 128,863.26 and 67,215.47

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Solution

The fourth proportional to 86,023.67, 128,863.26 and 67,215.47 is: 100,688.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,023.67 : 128,863.26 = 67,215.47 : x
  2. Step 2: Convert to fraction form
    86,023.67/128,863.26 = 67,215.47/x
  3. Step 3: Cross multiply
    86,023.67x = 128,863.26 × 67,215.47
  4. Step 4: Simplify right side
    86,023.67x = 8,661,603,942.32
  5. Step 5: Solve for x
    x = 8,661,603,942.32/86,023.67
  6. Step 6: Final answer
    x = 100,688.62

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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.