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Finding the Fourth Proportional to 21,362.80, 29,477.80 and 11,929.68

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Solution

The fourth proportional to 21,362.80, 29,477.80 and 11,929.68 is: 16,461.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,362.80 : 29,477.80 = 11,929.68 : x
  2. Step 2: Convert to fraction form
    21,362.80/29,477.80 = 11,929.68/x
  3. Step 3: Cross multiply
    21,362.80x = 29,477.80 × 11,929.68
  4. Step 4: Simplify right side
    21,362.80x = 351,660,721.10
  5. Step 5: Solve for x
    x = 351,660,721.10/21,362.80
  6. Step 6: Final answer
    x = 16,461.36

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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.