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Finding the Fourth Proportional to 65,781, 90,777.78 and 35,973

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Solution

The fourth proportional to 65,781, 90,777.78 and 35,973 is: 49,642.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,781 : 90,777.78 = 35,973 : x
  2. Step 2: Convert to fraction form
    65,781/90,777.78 = 35,973/x
  3. Step 3: Cross multiply
    65,781x = 90,777.78 × 35,973
  4. Step 4: Simplify right side
    65,781x = 3,265,549,079.94
  5. Step 5: Solve for x
    x = 3,265,549,079.94/65,781
  6. Step 6: Final answer
    x = 49,642.74

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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.