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Finding the Fourth Proportional to 21,169, 29,186.70 and 13,602.04

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Solution

The fourth proportional to 21,169, 29,186.70 and 13,602.04 is: 18,753.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,169 : 29,186.70 = 13,602.04 : x
  2. Step 2: Convert to fraction form
    21,169/29,186.70 = 13,602.04/x
  3. Step 3: Cross multiply
    21,169x = 29,186.70 × 13,602.04
  4. Step 4: Simplify right side
    21,169x = 396,998,660.87
  5. Step 5: Solve for x
    x = 396,998,660.87/21,169
  6. Step 6: Final answer
    x = 18,753.77

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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.