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Finding the Fourth Proportional to 86,687.12, 129,924.32 and 49,278.48

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Solution

The fourth proportional to 86,687.12, 129,924.32 and 49,278.48 is: 73,857.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,687.12 : 129,924.32 = 49,278.48 : x
  2. Step 2: Convert to fraction form
    86,687.12/129,924.32 = 49,278.48/x
  3. Step 3: Cross multiply
    86,687.12x = 129,924.32 × 49,278.48
  4. Step 4: Simplify right side
    86,687.12x = 6,402,473,004.63
  5. Step 5: Solve for x
    x = 6,402,473,004.63/86,687.12
  6. Step 6: Final answer
    x = 73,857.26

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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.