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Finding the Fourth Proportional to 8,913.70, 13,351.32 and 8,389.69

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Solution

The fourth proportional to 8,913.70, 13,351.32 and 8,389.69 is: 12,566.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,913.70 : 13,351.32 = 8,389.69 : x
  2. Step 2: Convert to fraction form
    8,913.70/13,351.32 = 8,389.69/x
  3. Step 3: Cross multiply
    8,913.70x = 13,351.32 × 8,389.69
  4. Step 4: Simplify right side
    8,913.70x = 112,013,402.51
  5. Step 5: Solve for x
    x = 112,013,402.51/8,913.70
  6. Step 6: Final answer
    x = 12,566.44

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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.