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Finding the Fourth Proportional to 72,011.74, 99,381 and 40,181.32

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Solution

The fourth proportional to 72,011.74, 99,381 and 40,181.32 is: 55,452.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,011.74 : 99,381 = 40,181.32 : x
  2. Step 2: Convert to fraction form
    72,011.74/99,381 = 40,181.32/x
  3. Step 3: Cross multiply
    72,011.74x = 99,381 × 40,181.32
  4. Step 4: Simplify right side
    72,011.74x = 3,993,259,762.92
  5. Step 5: Solve for x
    x = 3,993,259,762.92/72,011.74
  6. Step 6: Final answer
    x = 55,452.90

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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.