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Finding the Fourth Proportional to 158,638.32, 218,921.27 and 87,018.93

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Solution

The fourth proportional to 158,638.32, 218,921.27 and 87,018.93 is: 120,086.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,638.32 : 218,921.27 = 87,018.93 : x
  2. Step 2: Convert to fraction form
    158,638.32/218,921.27 = 87,018.93/x
  3. Step 3: Cross multiply
    158,638.32x = 218,921.27 × 87,018.93
  4. Step 4: Simplify right side
    158,638.32x = 19,050,294,234.55
  5. Step 5: Solve for x
    x = 19,050,294,234.55/158,638.32
  6. Step 6: Final answer
    x = 120,086.33

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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.