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Finding the Fourth Proportional to 8,558.40, 12,801.60 and 7,687.20

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Solution

The fourth proportional to 8,558.40, 12,801.60 and 7,687.20 is: 11,498.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,558.40 : 12,801.60 = 7,687.20 : x
  2. Step 2: Convert to fraction form
    8,558.40/12,801.60 = 7,687.20/x
  3. Step 3: Cross multiply
    8,558.40x = 12,801.60 × 7,687.20
  4. Step 4: Simplify right side
    8,558.40x = 98,408,459.52
  5. Step 5: Solve for x
    x = 98,408,459.52/8,558.40
  6. Step 6: Final answer
    x = 11,498.46

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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.