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Finding the Fourth Proportional to 7,221.76, 9,970.50 and 5,539.96

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Solution

The fourth proportional to 7,221.76, 9,970.50 and 5,539.96 is: 7,648.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.76 : 9,970.50 = 5,539.96 : x
  2. Step 2: Convert to fraction form
    7,221.76/9,970.50 = 5,539.96/x
  3. Step 3: Cross multiply
    7,221.76x = 9,970.50 × 5,539.96
  4. Step 4: Simplify right side
    7,221.76x = 55,236,171.18
  5. Step 5: Solve for x
    x = 55,236,171.18/7,221.76
  6. Step 6: Final answer
    x = 7,648.57

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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.