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Finding the Fourth Proportional to 7,129.80, 9,838.98 and 4,336.20

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Solution

The fourth proportional to 7,129.80, 9,838.98 and 4,336.20 is: 5,983.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.80 : 9,838.98 = 4,336.20 : x
  2. Step 2: Convert to fraction form
    7,129.80/9,838.98 = 4,336.20/x
  3. Step 3: Cross multiply
    7,129.80x = 9,838.98 × 4,336.20
  4. Step 4: Simplify right side
    7,129.80x = 42,663,785.08
  5. Step 5: Solve for x
    x = 42,663,785.08/7,129.80
  6. Step 6: Final answer
    x = 5,983.87

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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.