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Finding the Fourth Proportional to 15,008.61, 20,712.68 and 8,636.18

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Solution

The fourth proportional to 15,008.61, 20,712.68 and 8,636.18 is: 11,918.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,008.61 : 20,712.68 = 8,636.18 : x
  2. Step 2: Convert to fraction form
    15,008.61/20,712.68 = 8,636.18/x
  3. Step 3: Cross multiply
    15,008.61x = 20,712.68 × 8,636.18
  4. Step 4: Simplify right side
    15,008.61x = 178,878,318.40
  5. Step 5: Solve for x
    x = 178,878,318.40/15,008.61
  6. Step 6: Final answer
    x = 11,918.38

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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.