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Finding the Fourth Proportional to 21,643.52, 29,869.44 and 12,208.64

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Solution

The fourth proportional to 21,643.52, 29,869.44 and 12,208.64 is: 16,848.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,643.52 : 29,869.44 = 12,208.64 : x
  2. Step 2: Convert to fraction form
    21,643.52/29,869.44 = 12,208.64/x
  3. Step 3: Cross multiply
    21,643.52x = 29,869.44 × 12,208.64
  4. Step 4: Simplify right side
    21,643.52x = 364,665,239.96
  5. Step 5: Solve for x
    x = 364,665,239.96/21,643.52
  6. Step 6: Final answer
    x = 16,848.70

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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.