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Finding the Fourth Proportional to 154,390.52, 213,062.88 and 90,731.72

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Solution

The fourth proportional to 154,390.52, 213,062.88 and 90,731.72 is: 125,212.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,390.52 : 213,062.88 = 90,731.72 : x
  2. Step 2: Convert to fraction form
    154,390.52/213,062.88 = 90,731.72/x
  3. Step 3: Cross multiply
    154,390.52x = 213,062.88 × 90,731.72
  4. Step 4: Simplify right side
    154,390.52x = 19,331,561,570.55
  5. Step 5: Solve for x
    x = 19,331,561,570.55/154,390.52
  6. Step 6: Final answer
    x = 125,212.10

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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.