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Finding the Fourth Proportional to 154,842, 213,686.28 and 87,778.32

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Solution

The fourth proportional to 154,842, 213,686.28 and 87,778.32 is: 121,136.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,842 : 213,686.28 = 87,778.32 : x
  2. Step 2: Convert to fraction form
    154,842/213,686.28 = 87,778.32/x
  3. Step 3: Cross multiply
    154,842x = 213,686.28 × 87,778.32
  4. Step 4: Simplify right side
    154,842x = 18,757,022,665.45
  5. Step 5: Solve for x
    x = 18,757,022,665.45/154,842
  6. Step 6: Final answer
    x = 121,136.53

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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.