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Finding the Fourth Proportional to 8,617.02, 11,890.89 and 7,911.21

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Solution

The fourth proportional to 8,617.02, 11,890.89 and 7,911.21 is: 10,916.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,617.02 : 11,890.89 = 7,911.21 : x
  2. Step 2: Convert to fraction form
    8,617.02/11,890.89 = 7,911.21/x
  3. Step 3: Cross multiply
    8,617.02x = 11,890.89 × 7,911.21
  4. Step 4: Simplify right side
    8,617.02x = 94,071,327.88
  5. Step 5: Solve for x
    x = 94,071,327.88/8,617.02
  6. Step 6: Final answer
    x = 10,916.92

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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.