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Finding the Fourth Proportional to 6,439.36, 8,878.80 and 5,972.80

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Solution

The fourth proportional to 6,439.36, 8,878.80 and 5,972.80 is: 8,235.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,439.36 : 8,878.80 = 5,972.80 : x
  2. Step 2: Convert to fraction form
    6,439.36/8,878.80 = 5,972.80/x
  3. Step 3: Cross multiply
    6,439.36x = 8,878.80 × 5,972.80
  4. Step 4: Simplify right side
    6,439.36x = 53,031,296.64
  5. Step 5: Solve for x
    x = 53,031,296.64/6,439.36
  6. Step 6: Final answer
    x = 8,235.49

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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.