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Finding the Fourth Proportional to 8,681.57, 11,979.86 and 4,905.06

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Solution

The fourth proportional to 8,681.57, 11,979.86 and 4,905.06 is: 6,768.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,681.57 : 11,979.86 = 4,905.06 : x
  2. Step 2: Convert to fraction form
    8,681.57/11,979.86 = 4,905.06/x
  3. Step 3: Cross multiply
    8,681.57x = 11,979.86 × 4,905.06
  4. Step 4: Simplify right side
    8,681.57x = 58,761,937.52
  5. Step 5: Solve for x
    x = 58,761,937.52/8,681.57
  6. Step 6: Final answer
    x = 6,768.58

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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.