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Finding the Fourth Proportional to 72,479.10, 100,021.88 and 40,647.32

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Solution

The fourth proportional to 72,479.10, 100,021.88 and 40,647.32 is: 56,093.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,479.10 : 100,021.88 = 40,647.32 : x
  2. Step 2: Convert to fraction form
    72,479.10/100,021.88 = 40,647.32/x
  3. Step 3: Cross multiply
    72,479.10x = 100,021.88 × 40,647.32
  4. Step 4: Simplify right side
    72,479.10x = 4,065,620,964.87
  5. Step 5: Solve for x
    x = 4,065,620,964.87/72,479.10
  6. Step 6: Final answer
    x = 56,093.70

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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.