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Finding the Fourth Proportional to 72,950.78, 100,672.08 and 39,416.78

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Solution

The fourth proportional to 72,950.78, 100,672.08 and 39,416.78 is: 54,395.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,950.78 : 100,672.08 = 39,416.78 : x
  2. Step 2: Convert to fraction form
    72,950.78/100,672.08 = 39,416.78/x
  3. Step 3: Cross multiply
    72,950.78x = 100,672.08 × 39,416.78
  4. Step 4: Simplify right side
    72,950.78x = 3,968,169,229.50
  5. Step 5: Solve for x
    x = 3,968,169,229.50/72,950.78
  6. Step 6: Final answer
    x = 54,395.16

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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.