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Finding the Fourth Proportional to 9,991.56, 14,977.59 and 6,479.40

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Solution

The fourth proportional to 9,991.56, 14,977.59 and 6,479.40 is: 9,712.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.56 : 14,977.59 = 6,479.40 : x
  2. Step 2: Convert to fraction form
    9,991.56/14,977.59 = 6,479.40/x
  3. Step 3: Cross multiply
    9,991.56x = 14,977.59 × 6,479.40
  4. Step 4: Simplify right side
    9,991.56x = 97,045,796.65
  5. Step 5: Solve for x
    x = 97,045,796.65/9,991.56
  6. Step 6: Final answer
    x = 9,712.78

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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.