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Finding the Fourth Proportional to 65,221.54, 90,019.74 and 39,736.18

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Solution

The fourth proportional to 65,221.54, 90,019.74 and 39,736.18 is: 54,844.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,221.54 : 90,019.74 = 39,736.18 : x
  2. Step 2: Convert to fraction form
    65,221.54/90,019.74 = 39,736.18/x
  3. Step 3: Cross multiply
    65,221.54x = 90,019.74 × 39,736.18
  4. Step 4: Simplify right side
    65,221.54x = 3,577,040,592.19
  5. Step 5: Solve for x
    x = 3,577,040,592.19/65,221.54
  6. Step 6: Final answer
    x = 54,844.47

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1.5x scale

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.