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Finding the Fourth Proportional to 86,987.84, 119,976.72 and 74,909.24

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Solution

The fourth proportional to 86,987.84, 119,976.72 and 74,909.24 is: 103,317.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,987.84 : 119,976.72 = 74,909.24 : x
  2. Step 2: Convert to fraction form
    86,987.84/119,976.72 = 74,909.24/x
  3. Step 3: Cross multiply
    86,987.84x = 119,976.72 × 74,909.24
  4. Step 4: Simplify right side
    86,987.84x = 8,987,364,912.89
  5. Step 5: Solve for x
    x = 8,987,364,912.89/86,987.84
  6. Step 6: Final answer
    x = 103,317.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.