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Finding the Fourth Proportional to 28,658.70, 43,000.20 and 18,136.80

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Solution

The fourth proportional to 28,658.70, 43,000.20 and 18,136.80 is: 27,212.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,658.70 : 43,000.20 = 18,136.80 : x
  2. Step 2: Convert to fraction form
    28,658.70/43,000.20 = 18,136.80/x
  3. Step 3: Cross multiply
    28,658.70x = 43,000.20 × 18,136.80
  4. Step 4: Simplify right side
    28,658.70x = 779,886,027.36
  5. Step 5: Solve for x
    x = 779,886,027.36/28,658.70
  6. Step 6: Final answer
    x = 27,212.89

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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.