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Finding the Fourth Proportional to 21,602.64, 29,811.62 and 12,171.28

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Solution

The fourth proportional to 21,602.64, 29,811.62 and 12,171.28 is: 16,796.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,602.64 : 29,811.62 = 12,171.28 : x
  2. Step 2: Convert to fraction form
    21,602.64/29,811.62 = 12,171.28/x
  3. Step 3: Cross multiply
    21,602.64x = 29,811.62 × 12,171.28
  4. Step 4: Simplify right side
    21,602.64x = 362,845,574.27
  5. Step 5: Solve for x
    x = 362,845,574.27/21,602.64
  6. Step 6: Final answer
    x = 16,796.35

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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.