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Finding the Fourth Proportional to 20,602.59, 28,431.80 and 12,105.07

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Solution

The fourth proportional to 20,602.59, 28,431.80 and 12,105.07 is: 16,705.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,602.59 : 28,431.80 = 12,105.07 : x
  2. Step 2: Convert to fraction form
    20,602.59/28,431.80 = 12,105.07/x
  3. Step 3: Cross multiply
    20,602.59x = 28,431.80 × 12,105.07
  4. Step 4: Simplify right side
    20,602.59x = 344,168,929.23
  5. Step 5: Solve for x
    x = 344,168,929.23/20,602.59
  6. Step 6: Final answer
    x = 16,705.13

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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.