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Finding the Fourth Proportional to 10,665.81, 15,998.99 and 8,689.28

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Solution

The fourth proportional to 10,665.81, 15,998.99 and 8,689.28 is: 13,034.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,665.81 : 15,998.99 = 8,689.28 : x
  2. Step 2: Convert to fraction form
    10,665.81/15,998.99 = 8,689.28/x
  3. Step 3: Cross multiply
    10,665.81x = 15,998.99 × 8,689.28
  4. Step 4: Simplify right side
    10,665.81x = 139,019,580.39
  5. Step 5: Solve for x
    x = 139,019,580.39/10,665.81
  6. Step 6: Final answer
    x = 13,034.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.