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Finding the Fourth Proportional to 7,122.61, 9,829.35 and 3,978.80

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Solution

The fourth proportional to 7,122.61, 9,829.35 and 3,978.80 is: 5,490.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.61 : 9,829.35 = 3,978.80 : x
  2. Step 2: Convert to fraction form
    7,122.61/9,829.35 = 3,978.80/x
  3. Step 3: Cross multiply
    7,122.61x = 9,829.35 × 3,978.80
  4. Step 4: Simplify right side
    7,122.61x = 39,109,017.78
  5. Step 5: Solve for x
    x = 39,109,017.78/7,122.61
  6. Step 6: Final answer
    x = 5,490.83

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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.