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Finding the Fourth Proportional to 90,190.92, 124,513.56 and 54,390

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Solution

The fourth proportional to 90,190.92, 124,513.56 and 54,390 is: 75,088.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,190.92 : 124,513.56 = 54,390 : x
  2. Step 2: Convert to fraction form
    90,190.92/124,513.56 = 54,390/x
  3. Step 3: Cross multiply
    90,190.92x = 124,513.56 × 54,390
  4. Step 4: Simplify right side
    90,190.92x = 6,772,292,528.40
  5. Step 5: Solve for x
    x = 6,772,292,528.40/90,190.92
  6. Step 6: Final answer
    x = 75,088.41

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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.