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Finding the Fourth Proportional to 8,429.91, 12,640.95 and 4,920.93

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Solution

The fourth proportional to 8,429.91, 12,640.95 and 4,920.93 is: 7,379.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,429.91 : 12,640.95 = 4,920.93 : x
  2. Step 2: Convert to fraction form
    8,429.91/12,640.95 = 4,920.93/x
  3. Step 3: Cross multiply
    8,429.91x = 12,640.95 × 4,920.93
  4. Step 4: Simplify right side
    8,429.91x = 62,205,230.08
  5. Step 5: Solve for x
    x = 62,205,230.08/8,429.91
  6. Step 6: Final answer
    x = 7,379.11

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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.