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Finding the Fourth Proportional to 72,388.62, 99,900.36 and 40,567.74

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Solution

The fourth proportional to 72,388.62, 99,900.36 and 40,567.74 is: 55,985.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,388.62 : 99,900.36 = 40,567.74 : x
  2. Step 2: Convert to fraction form
    72,388.62/99,900.36 = 40,567.74/x
  3. Step 3: Cross multiply
    72,388.62x = 99,900.36 × 40,567.74
  4. Step 4: Simplify right side
    72,388.62x = 4,052,731,830.39
  5. Step 5: Solve for x
    x = 4,052,731,830.39/72,388.62
  6. Step 6: Final answer
    x = 55,985.76

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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.