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Finding the Fourth Proportional to 20,420,443.90, 28,609,879.10 and 20,420,443.90

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Solution

The fourth proportional to 20,420,443.90, 28,609,879.10 and 20,420,443.90 is: 28,609,879.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420,443.90 : 28,609,879.10 = 20,420,443.90 : x
  2. Step 2: Convert to fraction form
    20,420,443.90/28,609,879.10 = 20,420,443.90/x
  3. Step 3: Cross multiply
    20,420,443.90x = 28,609,879.10 × 20,420,443.90
  4. Step 4: Simplify right side
    20,420,443.90x = 584,226,431,147,332.50
  5. Step 5: Solve for x
    x = 584,226,431,147,332.50/20,420,443.90
  6. Step 6: Final answer
    x = 28,609,879.10

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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.