Home / 9,418.08-12,987.90-5,640.66

Finding the Fourth Proportional to 9,418.08, 12,987.90 and 5,640.66

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Solution

The fourth proportional to 9,418.08, 12,987.90 and 5,640.66 is: 7,778.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,418.08 : 12,987.90 = 5,640.66 : x
  2. Step 2: Convert to fraction form
    9,418.08/12,987.90 = 5,640.66/x
  3. Step 3: Cross multiply
    9,418.08x = 12,987.90 × 5,640.66
  4. Step 4: Simplify right side
    9,418.08x = 73,260,328.01
  5. Step 5: Solve for x
    x = 73,260,328.01/9,418.08
  6. Step 6: Final answer
    x = 7,778.69

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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.