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Finding the Fourth Proportional to 65,659.78, 90,606.77 and 38,804.79

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Solution

The fourth proportional to 65,659.78, 90,606.77 and 38,804.79 is: 53,548.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,659.78 : 90,606.77 = 38,804.79 : x
  2. Step 2: Convert to fraction form
    65,659.78/90,606.77 = 38,804.79/x
  3. Step 3: Cross multiply
    65,659.78x = 90,606.77 × 38,804.79
  4. Step 4: Simplify right side
    65,659.78x = 3,515,976,682.43
  5. Step 5: Solve for x
    x = 3,515,976,682.43/65,659.78
  6. Step 6: Final answer
    x = 53,548.41

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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.