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Finding the Fourth Proportional to 72,911.70, 100,618.13 and 39,377.70

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Solution

The fourth proportional to 72,911.70, 100,618.13 and 39,377.70 is: 54,341.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,911.70 : 100,618.13 = 39,377.70 : x
  2. Step 2: Convert to fraction form
    72,911.70/100,618.13 = 39,377.70/x
  3. Step 3: Cross multiply
    72,911.70x = 100,618.13 × 39,377.70
  4. Step 4: Simplify right side
    72,911.70x = 3,962,110,340.81
  5. Step 5: Solve for x
    x = 3,962,110,340.81/72,911.70
  6. Step 6: Final answer
    x = 54,341.21

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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.