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Finding the Fourth Proportional to 65,781.50, 90,778.47 and 35,973.50

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Solution

The fourth proportional to 65,781.50, 90,778.47 and 35,973.50 is: 49,643.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,781.50 : 90,778.47 = 35,973.50 : x
  2. Step 2: Convert to fraction form
    65,781.50/90,778.47 = 35,973.50/x
  3. Step 3: Cross multiply
    65,781.50x = 90,778.47 × 35,973.50
  4. Step 4: Simplify right side
    65,781.50x = 3,265,619,290.55
  5. Step 5: Solve for x
    x = 3,265,619,290.55/65,781.50
  6. Step 6: Final answer
    x = 49,643.43

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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.