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Finding the Fourth Proportional to 153,738.78, 212,159.46 and 86,670.78

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Solution

The fourth proportional to 153,738.78, 212,159.46 and 86,670.78 is: 119,605.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,738.78 : 212,159.46 = 86,670.78 : x
  2. Step 2: Convert to fraction form
    153,738.78/212,159.46 = 86,670.78/x
  3. Step 3: Cross multiply
    153,738.78x = 212,159.46 × 86,670.78
  4. Step 4: Simplify right side
    153,738.78x = 18,388,025,882.58
  5. Step 5: Solve for x
    x = 18,388,025,882.58/153,738.78
  6. Step 6: Final answer
    x = 119,605.64

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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.