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Finding the Fourth Proportional to 21,490.68, 29,658.54 and 12,059.88

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Solution

The fourth proportional to 21,490.68, 29,658.54 and 12,059.88 is: 16,643.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,490.68 : 29,658.54 = 12,059.88 : x
  2. Step 2: Convert to fraction form
    21,490.68/29,658.54 = 12,059.88/x
  3. Step 3: Cross multiply
    21,490.68x = 29,658.54 × 12,059.88
  4. Step 4: Simplify right side
    21,490.68x = 357,678,433.38
  5. Step 5: Solve for x
    x = 357,678,433.38/21,490.68
  6. Step 6: Final answer
    x = 16,643.42

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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.