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Finding the Fourth Proportional to 72,405.90, 99,920.07 and 40,575.02

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Solution

The fourth proportional to 72,405.90, 99,920.07 and 40,575.02 is: 55,993.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.90 : 99,920.07 = 40,575.02 : x
  2. Step 2: Convert to fraction form
    72,405.90/99,920.07 = 40,575.02/x
  3. Step 3: Cross multiply
    72,405.90x = 99,920.07 × 40,575.02
  4. Step 4: Simplify right side
    72,405.90x = 4,054,259,088.45
  5. Step 5: Solve for x
    x = 4,054,259,088.45/72,405.90
  6. Step 6: Final answer
    x = 55,993.49

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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.