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Finding the Fourth Proportional to 86,990.63, 130,502.34 and 40,243.50

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Solution

The fourth proportional to 86,990.63, 130,502.34 and 40,243.50 is: 60,372.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,990.63 : 130,502.34 = 40,243.50 : x
  2. Step 2: Convert to fraction form
    86,990.63/130,502.34 = 40,243.50/x
  3. Step 3: Cross multiply
    86,990.63x = 130,502.34 × 40,243.50
  4. Step 4: Simplify right side
    86,990.63x = 5,251,870,919.79
  5. Step 5: Solve for x
    x = 5,251,870,919.79/86,990.63
  6. Step 6: Final answer
    x = 60,372.84

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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.