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Finding the Fourth Proportional to 8,699.72, 12,088.89 and 8,609.40

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Solution

The fourth proportional to 8,699.72, 12,088.89 and 8,609.40 is: 11,963.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,699.72 : 12,088.89 = 8,609.40 : x
  2. Step 2: Convert to fraction form
    8,699.72/12,088.89 = 8,609.40/x
  3. Step 3: Cross multiply
    8,699.72x = 12,088.89 × 8,609.40
  4. Step 4: Simplify right side
    8,699.72x = 104,078,089.57
  5. Step 5: Solve for x
    x = 104,078,089.57/8,699.72
  6. Step 6: Final answer
    x = 11,963.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.