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Finding the Fourth Proportional to 8,645.28, 11,930.54 and 4,919.28

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Solution

The fourth proportional to 8,645.28, 11,930.54 and 4,919.28 is: 6,788.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,645.28 : 11,930.54 = 4,919.28 : x
  2. Step 2: Convert to fraction form
    8,645.28/11,930.54 = 4,919.28/x
  3. Step 3: Cross multiply
    8,645.28x = 11,930.54 × 4,919.28
  4. Step 4: Simplify right side
    8,645.28x = 58,689,666.81
  5. Step 5: Solve for x
    x = 58,689,666.81/8,645.28
  6. Step 6: Final answer
    x = 6,788.64

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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.