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Finding the Fourth Proportional to 9,885.64, 13,639.89 and 5,905.96

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Solution

The fourth proportional to 9,885.64, 13,639.89 and 5,905.96 is: 8,148.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,885.64 : 13,639.89 = 5,905.96 : x
  2. Step 2: Convert to fraction form
    9,885.64/13,639.89 = 5,905.96/x
  3. Step 3: Cross multiply
    9,885.64x = 13,639.89 × 5,905.96
  4. Step 4: Simplify right side
    9,885.64x = 80,556,644.74
  5. Step 5: Solve for x
    x = 80,556,644.74/9,885.64
  6. Step 6: Final answer
    x = 8,148.85

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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.