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Finding the Fourth Proportional to 8,386.40, 12,579.60 and 4,887.20

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Solution

The fourth proportional to 8,386.40, 12,579.60 and 4,887.20 is: 7,330.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,386.40 : 12,579.60 = 4,887.20 : x
  2. Step 2: Convert to fraction form
    8,386.40/12,579.60 = 4,887.20/x
  3. Step 3: Cross multiply
    8,386.40x = 12,579.60 × 4,887.20
  4. Step 4: Simplify right side
    8,386.40x = 61,479,021.12
  5. Step 5: Solve for x
    x = 61,479,021.12/8,386.40
  6. Step 6: Final answer
    x = 7,330.80

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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.