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Finding the Fourth Proportional to 8,659.77, 12,989.72 and 4,762.05

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Solution

The fourth proportional to 8,659.77, 12,989.72 and 4,762.05 is: 7,143.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.77 : 12,989.72 = 4,762.05 : x
  2. Step 2: Convert to fraction form
    8,659.77/12,989.72 = 4,762.05/x
  3. Step 3: Cross multiply
    8,659.77x = 12,989.72 × 4,762.05
  4. Step 4: Simplify right side
    8,659.77x = 61,857,696.13
  5. Step 5: Solve for x
    x = 61,857,696.13/8,659.77
  6. Step 6: Final answer
    x = 7,143.11

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1.5x scale

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.