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Finding the Fourth Proportional to 90,378.75, 135,615.40 and 65,623.28

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Solution

The fourth proportional to 90,378.75, 135,615.40 and 65,623.28 is: 98,469.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,378.75 : 135,615.40 = 65,623.28 : x
  2. Step 2: Convert to fraction form
    90,378.75/135,615.40 = 65,623.28/x
  3. Step 3: Cross multiply
    90,378.75x = 135,615.40 × 65,623.28
  4. Step 4: Simplify right side
    90,378.75x = 8,899,527,541.49
  5. Step 5: Solve for x
    x = 8,899,527,541.49/90,378.75
  6. Step 6: Final answer
    x = 98,469.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.