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Finding the Fourth Proportional to 8,916.17, 12,317.13 and 7,121.29

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Solution

The fourth proportional to 8,916.17, 12,317.13 and 7,121.29 is: 9,837.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,916.17 : 12,317.13 = 7,121.29 : x
  2. Step 2: Convert to fraction form
    8,916.17/12,317.13 = 7,121.29/x
  3. Step 3: Cross multiply
    8,916.17x = 12,317.13 × 7,121.29
  4. Step 4: Simplify right side
    8,916.17x = 87,713,870.09
  5. Step 5: Solve for x
    x = 87,713,870.09/8,916.17
  6. Step 6: Final answer
    x = 9,837.62

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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.