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Finding the Fourth Proportional to 8,658.40, 12,987.60 and 8,658.40

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Solution

The fourth proportional to 8,658.40, 12,987.60 and 8,658.40 is: 12,987.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.40 : 12,987.60 = 8,658.40 : x
  2. Step 2: Convert to fraction form
    8,658.40/12,987.60 = 8,658.40/x
  3. Step 3: Cross multiply
    8,658.40x = 12,987.60 × 8,658.40
  4. Step 4: Simplify right side
    8,658.40x = 112,451,835.84
  5. Step 5: Solve for x
    x = 112,451,835.84/8,658.40
  6. Step 6: Final answer
    x = 12,987.60

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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.