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Finding the Fourth Proportional to 21,700.94, 29,948.80 and 12,143.97

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Solution

The fourth proportional to 21,700.94, 29,948.80 and 12,143.97 is: 16,759.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,700.94 : 29,948.80 = 12,143.97 : x
  2. Step 2: Convert to fraction form
    21,700.94/29,948.80 = 12,143.97/x
  3. Step 3: Cross multiply
    21,700.94x = 29,948.80 × 12,143.97
  4. Step 4: Simplify right side
    21,700.94x = 363,697,298.38
  5. Step 5: Solve for x
    x = 363,697,298.38/21,700.94
  6. Step 6: Final answer
    x = 16,759.52

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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.