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Finding the Fourth Proportional to 28,136.70, 42,205.05 and 21,575.70

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Solution

The fourth proportional to 28,136.70, 42,205.05 and 21,575.70 is: 32,363.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,136.70 : 42,205.05 = 21,575.70 : x
  2. Step 2: Convert to fraction form
    28,136.70/42,205.05 = 21,575.70/x
  3. Step 3: Cross multiply
    28,136.70x = 42,205.05 × 21,575.70
  4. Step 4: Simplify right side
    28,136.70x = 910,603,497.29
  5. Step 5: Solve for x
    x = 910,603,497.29/28,136.70
  6. Step 6: Final answer
    x = 32,363.55

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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.