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Finding the Fourth Proportional to 72,929, 100,642.12 and 39,395

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Solution

The fourth proportional to 72,929, 100,642.12 and 39,395 is: 54,365.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,929 : 100,642.12 = 39,395 : x
  2. Step 2: Convert to fraction form
    72,929/100,642.12 = 39,395/x
  3. Step 3: Cross multiply
    72,929x = 100,642.12 × 39,395
  4. Step 4: Simplify right side
    72,929x = 3,964,796,317.40
  5. Step 5: Solve for x
    x = 3,964,796,317.40/72,929
  6. Step 6: Final answer
    x = 54,365.15

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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.