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Finding the Fourth Proportional to 158,640.31, 218,893.32 and 90,678.82

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Solution

The fourth proportional to 158,640.31, 218,893.32 and 90,678.82 is: 125,119.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,640.31 : 218,893.32 = 90,678.82 : x
  2. Step 2: Convert to fraction form
    158,640.31/218,893.32 = 90,678.82/x
  3. Step 3: Cross multiply
    158,640.31x = 218,893.32 × 90,678.82
  4. Step 4: Simplify right side
    158,640.31x = 19,848,987,963.48
  5. Step 5: Solve for x
    x = 19,848,987,963.48/158,640.31
  6. Step 6: Final answer
    x = 125,119.45

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1.5x scale

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.