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Finding the Fourth Proportional to 8,789.65, 12,129.70 and 4,810.77

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Solution

The fourth proportional to 8,789.65, 12,129.70 and 4,810.77 is: 6,638.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,789.65 : 12,129.70 = 4,810.77 : x
  2. Step 2: Convert to fraction form
    8,789.65/12,129.70 = 4,810.77/x
  3. Step 3: Cross multiply
    8,789.65x = 12,129.70 × 4,810.77
  4. Step 4: Simplify right side
    8,789.65x = 58,353,196.87
  5. Step 5: Solve for x
    x = 58,353,196.87/8,789.65
  6. Step 6: Final answer
    x = 6,638.85

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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.