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Finding the Fourth Proportional to 21,018.88, 29,005.88 and 11,587.48

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Solution

The fourth proportional to 21,018.88, 29,005.88 and 11,587.48 is: 15,990.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.88 : 29,005.88 = 11,587.48 : x
  2. Step 2: Convert to fraction form
    21,018.88/29,005.88 = 11,587.48/x
  3. Step 3: Cross multiply
    21,018.88x = 29,005.88 × 11,587.48
  4. Step 4: Simplify right side
    21,018.88x = 336,105,054.38
  5. Step 5: Solve for x
    x = 336,105,054.38/21,018.88
  6. Step 6: Final answer
    x = 15,990.63

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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.