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Finding the Fourth Proportional to 9,720.40, 14,580.60 and 8,165.20

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Solution

The fourth proportional to 9,720.40, 14,580.60 and 8,165.20 is: 12,247.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,720.40 : 14,580.60 = 8,165.20 : x
  2. Step 2: Convert to fraction form
    9,720.40/14,580.60 = 8,165.20/x
  3. Step 3: Cross multiply
    9,720.40x = 14,580.60 × 8,165.20
  4. Step 4: Simplify right side
    9,720.40x = 119,053,515.12
  5. Step 5: Solve for x
    x = 119,053,515.12/9,720.40
  6. Step 6: Final answer
    x = 12,247.80

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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.