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Finding the Fourth Proportional to 8,391.89, 12,587.16 and 4,879.65

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Solution

The fourth proportional to 8,391.89, 12,587.16 and 4,879.65 is: 7,319.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.89 : 12,587.16 = 4,879.65 : x
  2. Step 2: Convert to fraction form
    8,391.89/12,587.16 = 4,879.65/x
  3. Step 3: Cross multiply
    8,391.89x = 12,587.16 × 4,879.65
  4. Step 4: Simplify right side
    8,391.89x = 61,420,929.99
  5. Step 5: Solve for x
    x = 61,420,929.99/8,391.89
  6. Step 6: Final answer
    x = 7,319.08

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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.