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Finding the Fourth Proportional to 90,449, 124,819.62 and 55,121

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Solution

The fourth proportional to 90,449, 124,819.62 and 55,121 is: 76,066.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,449 : 124,819.62 = 55,121 : x
  2. Step 2: Convert to fraction form
    90,449/124,819.62 = 55,121/x
  3. Step 3: Cross multiply
    90,449x = 124,819.62 × 55,121
  4. Step 4: Simplify right side
    90,449x = 6,880,182,274.02
  5. Step 5: Solve for x
    x = 6,880,182,274.02/90,449
  6. Step 6: Final answer
    x = 76,066.98

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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.