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Finding the Fourth Proportional to 72,991.81, 100,728.77 and 42,771.12

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Solution

The fourth proportional to 72,991.81, 100,728.77 and 42,771.12 is: 59,024.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.81 : 100,728.77 = 42,771.12 : x
  2. Step 2: Convert to fraction form
    72,991.81/100,728.77 = 42,771.12/x
  3. Step 3: Cross multiply
    72,991.81x = 100,728.77 × 42,771.12
  4. Step 4: Simplify right side
    72,991.81x = 4,308,282,309.12
  5. Step 5: Solve for x
    x = 4,308,282,309.12/72,991.81
  6. Step 6: Final answer
    x = 59,024.19

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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.