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Finding the Fourth Proportional to 7,279.86, 10,921.80 and 2,900.40

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Solution

The fourth proportional to 7,279.86, 10,921.80 and 2,900.40 is: 4,351.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279.86 : 10,921.80 = 2,900.40 : x
  2. Step 2: Convert to fraction form
    7,279.86/10,921.80 = 2,900.40/x
  3. Step 3: Cross multiply
    7,279.86x = 10,921.80 × 2,900.40
  4. Step 4: Simplify right side
    7,279.86x = 31,677,588.72
  5. Step 5: Solve for x
    x = 31,677,588.72/7,279.86
  6. Step 6: Final answer
    x = 4,351.40

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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.