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Finding the Fourth Proportional to 7,042.55, 9,718.30 and 3,855.21

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Solution

The fourth proportional to 7,042.55, 9,718.30 and 3,855.21 is: 5,319.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,042.55 : 9,718.30 = 3,855.21 : x
  2. Step 2: Convert to fraction form
    7,042.55/9,718.30 = 3,855.21/x
  3. Step 3: Cross multiply
    7,042.55x = 9,718.30 × 3,855.21
  4. Step 4: Simplify right side
    7,042.55x = 37,466,087.34
  5. Step 5: Solve for x
    x = 37,466,087.34/7,042.55
  6. Step 6: Final answer
    x = 5,319.96

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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.