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Finding the Fourth Proportional to 101,431.86, 139,928.81 and 65,633.43

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Solution

The fourth proportional to 101,431.86, 139,928.81 and 65,633.43 is: 90,543.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,431.86 : 139,928.81 = 65,633.43 : x
  2. Step 2: Convert to fraction form
    101,431.86/139,928.81 = 65,633.43/x
  3. Step 3: Cross multiply
    101,431.86x = 139,928.81 × 65,633.43
  4. Step 4: Simplify right side
    101,431.86x = 9,184,007,427.95
  5. Step 5: Solve for x
    x = 9,184,007,427.95/101,431.86
  6. Step 6: Final answer
    x = 90,543.62

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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.