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Finding the Fourth Proportional to 9,986.12, 14,978.28 and 4,439.72

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Solution

The fourth proportional to 9,986.12, 14,978.28 and 4,439.72 is: 6,659.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,986.12 : 14,978.28 = 4,439.72 : x
  2. Step 2: Convert to fraction form
    9,986.12/14,978.28 = 4,439.72/x
  3. Step 3: Cross multiply
    9,986.12x = 14,978.28 × 4,439.72
  4. Step 4: Simplify right side
    9,986.12x = 66,499,369.28
  5. Step 5: Solve for x
    x = 66,499,369.28/9,986.12
  6. Step 6: Final answer
    x = 6,659.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.