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Finding the Fourth Proportional to 7,291.20, 10,936.80 and 6,805.20

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Solution

The fourth proportional to 7,291.20, 10,936.80 and 6,805.20 is: 10,207.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,291.20 : 10,936.80 = 6,805.20 : x
  2. Step 2: Convert to fraction form
    7,291.20/10,936.80 = 6,805.20/x
  3. Step 3: Cross multiply
    7,291.20x = 10,936.80 × 6,805.20
  4. Step 4: Simplify right side
    7,291.20x = 74,427,111.36
  5. Step 5: Solve for x
    x = 74,427,111.36/7,291.20
  6. Step 6: Final answer
    x = 10,207.80

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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.