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Finding the Fourth Proportional to 72,400.50, 99,904.59 and 40,564.80

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Solution

The fourth proportional to 72,400.50, 99,904.59 and 40,564.80 is: 55,974.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,400.50 : 99,904.59 = 40,564.80 : x
  2. Step 2: Convert to fraction form
    72,400.50/99,904.59 = 40,564.80/x
  3. Step 3: Cross multiply
    72,400.50x = 99,904.59 × 40,564.80
  4. Step 4: Simplify right side
    72,400.50x = 4,052,609,712.43
  5. Step 5: Solve for x
    x = 4,052,609,712.43/72,400.50
  6. Step 6: Final answer
    x = 55,974.89

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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.