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Finding the Fourth Proportional to 8,789.64, 12,129.74 and 4,810.80

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Solution

The fourth proportional to 8,789.64, 12,129.74 and 4,810.80 is: 6,638.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,789.64 : 12,129.74 = 4,810.80 : x
  2. Step 2: Convert to fraction form
    8,789.64/12,129.74 = 4,810.80/x
  3. Step 3: Cross multiply
    8,789.64x = 12,129.74 × 4,810.80
  4. Step 4: Simplify right side
    8,789.64x = 58,353,753.19
  5. Step 5: Solve for x
    x = 58,353,753.19/8,789.64
  6. Step 6: Final answer
    x = 6,638.92

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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.