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Finding the Fourth Proportional to 9,906.68, 13,671.12 and 5,430.38

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Solution

The fourth proportional to 9,906.68, 13,671.12 and 5,430.38 is: 7,493.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,906.68 : 13,671.12 = 5,430.38 : x
  2. Step 2: Convert to fraction form
    9,906.68/13,671.12 = 5,430.38/x
  3. Step 3: Cross multiply
    9,906.68x = 13,671.12 × 5,430.38
  4. Step 4: Simplify right side
    9,906.68x = 74,239,376.63
  5. Step 5: Solve for x
    x = 74,239,376.63/9,906.68
  6. Step 6: Final answer
    x = 7,493.87

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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.