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Finding the Fourth Proportional to 8,689.62, 11,991.70 and 4,710.72

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Solution

The fourth proportional to 8,689.62, 11,991.70 and 4,710.72 is: 6,500.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.62 : 11,991.70 = 4,710.72 : x
  2. Step 2: Convert to fraction form
    8,689.62/11,991.70 = 4,710.72/x
  3. Step 3: Cross multiply
    8,689.62x = 11,991.70 × 4,710.72
  4. Step 4: Simplify right side
    8,689.62x = 56,489,541.02
  5. Step 5: Solve for x
    x = 56,489,541.02/8,689.62
  6. Step 6: Final answer
    x = 6,500.81

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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.