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Finding the Fourth Proportional to 9,639, 13,290.48 and 6,489.72

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Solution

The fourth proportional to 9,639, 13,290.48 and 6,489.72 is: 8,948.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,639 : 13,290.48 = 6,489.72 : x
  2. Step 2: Convert to fraction form
    9,639/13,290.48 = 6,489.72/x
  3. Step 3: Cross multiply
    9,639x = 13,290.48 × 6,489.72
  4. Step 4: Simplify right side
    9,639x = 86,251,493.87
  5. Step 5: Solve for x
    x = 86,251,493.87/9,639
  6. Step 6: Final answer
    x = 8,948.18

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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.