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Finding the Fourth Proportional to 8,762.70, 13,139.70 and 3,215.82

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Solution

The fourth proportional to 8,762.70, 13,139.70 and 3,215.82 is: 4,822.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,762.70 : 13,139.70 = 3,215.82 : x
  2. Step 2: Convert to fraction form
    8,762.70/13,139.70 = 3,215.82/x
  3. Step 3: Cross multiply
    8,762.70x = 13,139.70 × 3,215.82
  4. Step 4: Simplify right side
    8,762.70x = 42,254,910.05
  5. Step 5: Solve for x
    x = 42,254,910.05/8,762.70
  6. Step 6: Final answer
    x = 4,822.13

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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.