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Finding the Fourth Proportional to 9,991.80, 14,987.70 and 8,606.70

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Solution

The fourth proportional to 9,991.80, 14,987.70 and 8,606.70 is: 12,910.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.80 : 14,987.70 = 8,606.70 : x
  2. Step 2: Convert to fraction form
    9,991.80/14,987.70 = 8,606.70/x
  3. Step 3: Cross multiply
    9,991.80x = 14,987.70 × 8,606.70
  4. Step 4: Simplify right side
    9,991.80x = 128,994,637.59
  5. Step 5: Solve for x
    x = 128,994,637.59/9,991.80
  6. Step 6: Final answer
    x = 12,910.05

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Similar ratio
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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.