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Finding the Fourth Proportional to 8,615.85, 11,888.97 and 5,782.65

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Solution

The fourth proportional to 8,615.85, 11,888.97 and 5,782.65 is: 7,979.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.85 : 11,888.97 = 5,782.65 : x
  2. Step 2: Convert to fraction form
    8,615.85/11,888.97 = 5,782.65/x
  3. Step 3: Cross multiply
    8,615.85x = 11,888.97 × 5,782.65
  4. Step 4: Simplify right side
    8,615.85x = 68,749,752.37
  5. Step 5: Solve for x
    x = 68,749,752.37/8,615.85
  6. Step 6: Final answer
    x = 7,979.45

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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.