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Finding the Fourth Proportional to 8,637.66, 12,980.86 and 5,128.27

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Solution

The fourth proportional to 8,637.66, 12,980.86 and 5,128.27 is: 7,706.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,637.66 : 12,980.86 = 5,128.27 : x
  2. Step 2: Convert to fraction form
    8,637.66/12,980.86 = 5,128.27/x
  3. Step 3: Cross multiply
    8,637.66x = 12,980.86 × 5,128.27
  4. Step 4: Simplify right side
    8,637.66x = 66,569,309.64
  5. Step 5: Solve for x
    x = 66,569,309.64/8,637.66
  6. Step 6: Final answer
    x = 7,706.87

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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.