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Finding the Fourth Proportional to 72,808.44, 100,478.88 and 40,979.40

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Solution

The fourth proportional to 72,808.44, 100,478.88 and 40,979.40 is: 56,553.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,808.44 : 100,478.88 = 40,979.40 : x
  2. Step 2: Convert to fraction form
    72,808.44/100,478.88 = 40,979.40/x
  3. Step 3: Cross multiply
    72,808.44x = 100,478.88 × 40,979.40
  4. Step 4: Simplify right side
    72,808.44x = 4,117,564,215.07
  5. Step 5: Solve for x
    x = 4,117,564,215.07/72,808.44
  6. Step 6: Final answer
    x = 56,553.39

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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.