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Finding the Fourth Proportional to 21,072, 29,079.36 and 12,690.12

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Solution

The fourth proportional to 21,072, 29,079.36 and 12,690.12 is: 17,512.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,072 : 29,079.36 = 12,690.12 : x
  2. Step 2: Convert to fraction form
    21,072/29,079.36 = 12,690.12/x
  3. Step 3: Cross multiply
    21,072x = 29,079.36 × 12,690.12
  4. Step 4: Simplify right side
    21,072x = 369,020,567.92
  5. Step 5: Solve for x
    x = 369,020,567.92/21,072
  6. Step 6: Final answer
    x = 17,512.37

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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.