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Finding the Fourth Proportional to 8,605.11, 11,877.54 and 5,621.40

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Solution

The fourth proportional to 8,605.11, 11,877.54 and 5,621.40 is: 7,759.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,605.11 : 11,877.54 = 5,621.40 : x
  2. Step 2: Convert to fraction form
    8,605.11/11,877.54 = 5,621.40/x
  3. Step 3: Cross multiply
    8,605.11x = 11,877.54 × 5,621.40
  4. Step 4: Simplify right side
    8,605.11x = 66,768,403.36
  5. Step 5: Solve for x
    x = 66,768,403.36/8,605.11
  6. Step 6: Final answer
    x = 7,759.16

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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.