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Finding the Fourth Proportional to 21,239.20, 29,310 and 11,807.20

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Solution

The fourth proportional to 21,239.20, 29,310 and 11,807.20 is: 16,293.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.20 : 29,310 = 11,807.20 : x
  2. Step 2: Convert to fraction form
    21,239.20/29,310 = 11,807.20/x
  3. Step 3: Cross multiply
    21,239.20x = 29,310 × 11,807.20
  4. Step 4: Simplify right side
    21,239.20x = 346,069,032
  5. Step 5: Solve for x
    x = 346,069,032/21,239.20
  6. Step 6: Final answer
    x = 16,293.88

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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.