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Finding the Fourth Proportional to 72,908.50, 100,613.75 and 39,374.50

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Solution

The fourth proportional to 72,908.50, 100,613.75 and 39,374.50 is: 54,336.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,908.50 : 100,613.75 = 39,374.50 : x
  2. Step 2: Convert to fraction form
    72,908.50/100,613.75 = 39,374.50/x
  3. Step 3: Cross multiply
    72,908.50x = 100,613.75 × 39,374.50
  4. Step 4: Simplify right side
    72,908.50x = 3,961,616,099.38
  5. Step 5: Solve for x
    x = 3,961,616,099.38/72,908.50
  6. Step 6: Final answer
    x = 54,336.82

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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.