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Finding the Fourth Proportional to 7,279.80, 10,919.70 and 7,158.30

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Solution

The fourth proportional to 7,279.80, 10,919.70 and 7,158.30 is: 10,737.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279.80 : 10,919.70 = 7,158.30 : x
  2. Step 2: Convert to fraction form
    7,279.80/10,919.70 = 7,158.30/x
  3. Step 3: Cross multiply
    7,279.80x = 10,919.70 × 7,158.30
  4. Step 4: Simplify right side
    7,279.80x = 78,166,488.51
  5. Step 5: Solve for x
    x = 78,166,488.51/7,279.80
  6. Step 6: Final answer
    x = 10,737.45

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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.