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Finding the Fourth Proportional to 8,986.40, 13,479.60 and 7,431.20

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Solution

The fourth proportional to 8,986.40, 13,479.60 and 7,431.20 is: 11,146.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,986.40 : 13,479.60 = 7,431.20 : x
  2. Step 2: Convert to fraction form
    8,986.40/13,479.60 = 7,431.20/x
  3. Step 3: Cross multiply
    8,986.40x = 13,479.60 × 7,431.20
  4. Step 4: Simplify right side
    8,986.40x = 100,169,603.52
  5. Step 5: Solve for x
    x = 100,169,603.52/8,986.40
  6. Step 6: Final answer
    x = 11,146.80

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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.