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Finding the Fourth Proportional to 21,335.76, 29,443.28 and 11,904.32

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Solution

The fourth proportional to 21,335.76, 29,443.28 and 11,904.32 is: 16,427.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,335.76 : 29,443.28 = 11,904.32 : x
  2. Step 2: Convert to fraction form
    21,335.76/29,443.28 = 11,904.32/x
  3. Step 3: Cross multiply
    21,335.76x = 29,443.28 × 11,904.32
  4. Step 4: Simplify right side
    21,335.76x = 350,502,020.23
  5. Step 5: Solve for x
    x = 350,502,020.23/21,335.76
  6. Step 6: Final answer
    x = 16,427.91

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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.