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Finding the Fourth Proportional to 28,613.86, 42,919.86 and 8,623.46

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Solution

The fourth proportional to 28,613.86, 42,919.86 and 8,623.46 is: 12,934.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,613.86 : 42,919.86 = 8,623.46 : x
  2. Step 2: Convert to fraction form
    28,613.86/42,919.86 = 8,623.46/x
  3. Step 3: Cross multiply
    28,613.86x = 42,919.86 × 8,623.46
  4. Step 4: Simplify right side
    28,613.86x = 370,117,695.92
  5. Step 5: Solve for x
    x = 370,117,695.92/28,613.86
  6. Step 6: Final answer
    x = 12,934.91

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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.