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Finding the Fourth Proportional to 70,929, 106,410.78 and 21,681

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Solution

The fourth proportional to 70,929, 106,410.78 and 21,681 is: 32,526.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,929 : 106,410.78 = 21,681 : x
  2. Step 2: Convert to fraction form
    70,929/106,410.78 = 21,681/x
  3. Step 3: Cross multiply
    70,929x = 106,410.78 × 21,681
  4. Step 4: Simplify right side
    70,929x = 2,307,092,121.18
  5. Step 5: Solve for x
    x = 2,307,092,121.18/70,929
  6. Step 6: Final answer
    x = 32,526.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.