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Finding the Fourth Proportional to 72,911.63, 100,618.05 and 39,377.63

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Solution

The fourth proportional to 72,911.63, 100,618.05 and 39,377.63 is: 54,341.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,911.63 : 100,618.05 = 39,377.63 : x
  2. Step 2: Convert to fraction form
    72,911.63/100,618.05 = 39,377.63/x
  3. Step 3: Cross multiply
    72,911.63x = 100,618.05 × 39,377.63
  4. Step 4: Simplify right side
    72,911.63x = 3,962,099,841.13
  5. Step 5: Solve for x
    x = 3,962,099,841.13/72,911.63
  6. Step 6: Final answer
    x = 54,341.13

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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.