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Finding the Fourth Proportional to 86,905.31, 130,396.23 and 36,990.68

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Solution

The fourth proportional to 86,905.31, 130,396.23 and 36,990.68 is: 55,502.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,905.31 : 130,396.23 = 36,990.68 : x
  2. Step 2: Convert to fraction form
    86,905.31/130,396.23 = 36,990.68/x
  3. Step 3: Cross multiply
    86,905.31x = 130,396.23 × 36,990.68
  4. Step 4: Simplify right side
    86,905.31x = 4,823,444,565.16
  5. Step 5: Solve for x
    x = 4,823,444,565.16/86,905.31
  6. Step 6: Final answer
    x = 55,502.30

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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.