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Finding the Fourth Proportional to 7,751.80, 10,697.60 and 4,215.08

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Solution

The fourth proportional to 7,751.80, 10,697.60 and 4,215.08 is: 5,816.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,751.80 : 10,697.60 = 4,215.08 : x
  2. Step 2: Convert to fraction form
    7,751.80/10,697.60 = 4,215.08/x
  3. Step 3: Cross multiply
    7,751.80x = 10,697.60 × 4,215.08
  4. Step 4: Simplify right side
    7,751.80x = 45,091,239.81
  5. Step 5: Solve for x
    x = 45,091,239.81/7,751.80
  6. Step 6: Final answer
    x = 5,816.87

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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.