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Finding the Fourth Proportional to 8,712.20, 12,022.64 and 5,078.01

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Solution

The fourth proportional to 8,712.20, 12,022.64 and 5,078.01 is: 7,007.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.20 : 12,022.64 = 5,078.01 : x
  2. Step 2: Convert to fraction form
    8,712.20/12,022.64 = 5,078.01/x
  3. Step 3: Cross multiply
    8,712.20x = 12,022.64 × 5,078.01
  4. Step 4: Simplify right side
    8,712.20x = 61,051,060.76
  5. Step 5: Solve for x
    x = 61,051,060.76/8,712.20
  6. Step 6: Final answer
    x = 7,007.54

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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.