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Finding the Fourth Proportional to 154,628.55, 213,399.72 and 90,978.66

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Solution

The fourth proportional to 154,628.55, 213,399.72 and 90,978.66 is: 125,557.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,628.55 : 213,399.72 = 90,978.66 : x
  2. Step 2: Convert to fraction form
    154,628.55/213,399.72 = 90,978.66/x
  3. Step 3: Cross multiply
    154,628.55x = 213,399.72 × 90,978.66
  4. Step 4: Simplify right side
    154,628.55x = 19,414,820,569.98
  5. Step 5: Solve for x
    x = 19,414,820,569.98/154,628.55
  6. Step 6: Final answer
    x = 125,557.80

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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.