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Finding the Fourth Proportional to 72,808.94, 100,479.57 and 40,979.90

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Solution

The fourth proportional to 72,808.94, 100,479.57 and 40,979.90 is: 56,554.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,808.94 : 100,479.57 = 40,979.90 : x
  2. Step 2: Convert to fraction form
    72,808.94/100,479.57 = 40,979.90/x
  3. Step 3: Cross multiply
    72,808.94x = 100,479.57 × 40,979.90
  4. Step 4: Simplify right side
    72,808.94x = 4,117,642,730.64
  5. Step 5: Solve for x
    x = 4,117,642,730.64/72,808.94
  6. Step 6: Final answer
    x = 56,554.08

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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.