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Finding the Fourth Proportional to 8,645.79, 11,931.80 and 4,919.79

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Solution

The fourth proportional to 8,645.79, 11,931.80 and 4,919.79 is: 6,789.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,645.79 : 11,931.80 = 4,919.79 : x
  2. Step 2: Convert to fraction form
    8,645.79/11,931.80 = 4,919.79/x
  3. Step 3: Cross multiply
    8,645.79x = 11,931.80 × 4,919.79
  4. Step 4: Simplify right side
    8,645.79x = 58,701,925.72
  5. Step 5: Solve for x
    x = 58,701,925.72/8,645.79
  6. Step 6: Final answer
    x = 6,789.65

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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.