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Finding the Fourth Proportional to 7,113.16, 9,819.49 and 4,128.42

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Solution

The fourth proportional to 7,113.16, 9,819.49 and 4,128.42 is: 5,699.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,113.16 : 9,819.49 = 4,128.42 : x
  2. Step 2: Convert to fraction form
    7,113.16/9,819.49 = 4,128.42/x
  3. Step 3: Cross multiply
    7,113.16x = 9,819.49 × 4,128.42
  4. Step 4: Simplify right side
    7,113.16x = 40,538,981.73
  5. Step 5: Solve for x
    x = 40,538,981.73/7,113.16
  6. Step 6: Final answer
    x = 5,699.15

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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.