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Finding the Fourth Proportional to 153,888, 212,365.44 and 86,818.56

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Solution

The fourth proportional to 153,888, 212,365.44 and 86,818.56 is: 119,809.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,888 : 212,365.44 = 86,818.56 : x
  2. Step 2: Convert to fraction form
    153,888/212,365.44 = 86,818.56/x
  3. Step 3: Cross multiply
    153,888x = 212,365.44 × 86,818.56
  4. Step 4: Simplify right side
    153,888x = 18,437,261,694.57
  5. Step 5: Solve for x
    x = 18,437,261,694.57/153,888
  6. Step 6: Final answer
    x = 119,809.61

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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.