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Finding the Fourth Proportional to 72,703.96, 100,328.78 and 40,438.44

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Solution

The fourth proportional to 72,703.96, 100,328.78 and 40,438.44 is: 55,803.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,703.96 : 100,328.78 = 40,438.44 : x
  2. Step 2: Convert to fraction form
    72,703.96/100,328.78 = 40,438.44/x
  3. Step 3: Cross multiply
    72,703.96x = 100,328.78 × 40,438.44
  4. Step 4: Simplify right side
    72,703.96x = 4,057,139,350.30
  5. Step 5: Solve for x
    x = 4,057,139,350.30/72,703.96
  6. Step 6: Final answer
    x = 55,803.55

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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.