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Finding the Fourth Proportional to 7,156.12, 9,879.16 and 5,559.20

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Solution

The fourth proportional to 7,156.12, 9,879.16 and 5,559.20 is: 7,674.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,156.12 : 9,879.16 = 5,559.20 : x
  2. Step 2: Convert to fraction form
    7,156.12/9,879.16 = 5,559.20/x
  3. Step 3: Cross multiply
    7,156.12x = 9,879.16 × 5,559.20
  4. Step 4: Simplify right side
    7,156.12x = 54,920,226.27
  5. Step 5: Solve for x
    x = 54,920,226.27/7,156.12
  6. Step 6: Final answer
    x = 7,674.58

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Half scale
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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.