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Finding the Fourth Proportional to 20,115.70, 28,220.30 and 20,115.70

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Solution

The fourth proportional to 20,115.70, 28,220.30 and 20,115.70 is: 28,220.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,115.70 : 28,220.30 = 20,115.70 : x
  2. Step 2: Convert to fraction form
    20,115.70/28,220.30 = 20,115.70/x
  3. Step 3: Cross multiply
    20,115.70x = 28,220.30 × 20,115.70
  4. Step 4: Simplify right side
    20,115.70x = 567,671,088.71
  5. Step 5: Solve for x
    x = 567,671,088.71/20,115.70
  6. Step 6: Final answer
    x = 28,220.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.