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Finding the Fourth Proportional to 72,930.13, 100,643.67 and 39,396.13

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Solution

The fourth proportional to 72,930.13, 100,643.67 and 39,396.13 is: 54,366.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,930.13 : 100,643.67 = 39,396.13 : x
  2. Step 2: Convert to fraction form
    72,930.13/100,643.67 = 39,396.13/x
  3. Step 3: Cross multiply
    72,930.13x = 100,643.67 × 39,396.13
  4. Step 4: Simplify right side
    72,930.13x = 3,964,970,406.80
  5. Step 5: Solve for x
    x = 3,964,970,406.80/72,930.13
  6. Step 6: Final answer
    x = 54,366.70

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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.