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Finding the Fourth Proportional to 7,129.22, 9,841.05 and 6,381.86

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Solution

The fourth proportional to 7,129.22, 9,841.05 and 6,381.86 is: 8,809.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.22 : 9,841.05 = 6,381.86 : x
  2. Step 2: Convert to fraction form
    7,129.22/9,841.05 = 6,381.86/x
  3. Step 3: Cross multiply
    7,129.22x = 9,841.05 × 6,381.86
  4. Step 4: Simplify right side
    7,129.22x = 62,804,154.15
  5. Step 5: Solve for x
    x = 62,804,154.15/7,129.22
  6. Step 6: Final answer
    x = 8,809.41

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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.