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Finding the Fourth Proportional to 86,837.70, 130,168.15 and 39,486.42

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Solution

The fourth proportional to 86,837.70, 130,168.15 and 39,486.42 is: 59,189.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,837.70 : 130,168.15 = 39,486.42 : x
  2. Step 2: Convert to fraction form
    86,837.70/130,168.15 = 39,486.42/x
  3. Step 3: Cross multiply
    86,837.70x = 130,168.15 × 39,486.42
  4. Step 4: Simplify right side
    86,837.70x = 5,139,874,142.81
  5. Step 5: Solve for x
    x = 5,139,874,142.81/86,837.70
  6. Step 6: Final answer
    x = 59,189.43

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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.