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Finding the Fourth Proportional to 21,001.86, 28,972.80 and 12,499.22

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Solution

The fourth proportional to 21,001.86, 28,972.80 and 12,499.22 is: 17,243.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.86 : 28,972.80 = 12,499.22 : x
  2. Step 2: Convert to fraction form
    21,001.86/28,972.80 = 12,499.22/x
  3. Step 3: Cross multiply
    21,001.86x = 28,972.80 × 12,499.22
  4. Step 4: Simplify right side
    21,001.86x = 362,137,473.65
  5. Step 5: Solve for x
    x = 362,137,473.65/21,001.86
  6. Step 6: Final answer
    x = 17,243.11

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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.