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Finding the Fourth Proportional to 8,904.60, 12,289.28 and 5,128.76

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Solution

The fourth proportional to 8,904.60, 12,289.28 and 5,128.76 is: 7,078.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,904.60 : 12,289.28 = 5,128.76 : x
  2. Step 2: Convert to fraction form
    8,904.60/12,289.28 = 5,128.76/x
  3. Step 3: Cross multiply
    8,904.60x = 12,289.28 × 5,128.76
  4. Step 4: Simplify right side
    8,904.60x = 63,028,767.69
  5. Step 5: Solve for x
    x = 63,028,767.69/8,904.60
  6. Step 6: Final answer
    x = 7,078.23

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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.