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Finding the Fourth Proportional to 12,658.45, 18,987.68 and 4,861.80

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Solution

The fourth proportional to 12,658.45, 18,987.68 and 4,861.80 is: 7,292.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.45 : 18,987.68 = 4,861.80 : x
  2. Step 2: Convert to fraction form
    12,658.45/18,987.68 = 4,861.80/x
  3. Step 3: Cross multiply
    12,658.45x = 18,987.68 × 4,861.80
  4. Step 4: Simplify right side
    12,658.45x = 92,314,302.62
  5. Step 5: Solve for x
    x = 92,314,302.62/12,658.45
  6. Step 6: Final answer
    x = 7,292.70

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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.