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Finding the Fourth Proportional to 154,791.90, 213,597.90 and 86,811.66

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Solution

The fourth proportional to 154,791.90, 213,597.90 and 86,811.66 is: 119,791.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,791.90 : 213,597.90 = 86,811.66 : x
  2. Step 2: Convert to fraction form
    154,791.90/213,597.90 = 86,811.66/x
  3. Step 3: Cross multiply
    154,791.90x = 213,597.90 × 86,811.66
  4. Step 4: Simplify right side
    154,791.90x = 18,542,788,271.51
  5. Step 5: Solve for x
    x = 18,542,788,271.51/154,791.90
  6. Step 6: Final answer
    x = 119,791.72

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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.