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Finding the Fourth Proportional to 7,279.80, 10,916.90 and 3,117.16

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Solution

The fourth proportional to 7,279.80, 10,916.90 and 3,117.16 is: 4,674.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279.80 : 10,916.90 = 3,117.16 : x
  2. Step 2: Convert to fraction form
    7,279.80/10,916.90 = 3,117.16/x
  3. Step 3: Cross multiply
    7,279.80x = 10,916.90 × 3,117.16
  4. Step 4: Simplify right side
    7,279.80x = 34,029,724.00
  5. Step 5: Solve for x
    x = 34,029,724.00/7,279.80
  6. Step 6: Final answer
    x = 4,674.54

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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.