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Finding the Fourth Proportional to 8,358.88, 12,515.64 and 5,429.92

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Solution

The fourth proportional to 8,358.88, 12,515.64 and 5,429.92 is: 8,130.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,358.88 : 12,515.64 = 5,429.92 : x
  2. Step 2: Convert to fraction form
    8,358.88/12,515.64 = 5,429.92/x
  3. Step 3: Cross multiply
    8,358.88x = 12,515.64 × 5,429.92
  4. Step 4: Simplify right side
    8,358.88x = 67,958,923.95
  5. Step 5: Solve for x
    x = 67,958,923.95/8,358.88
  6. Step 6: Final answer
    x = 8,130.15

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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.