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Finding the Fourth Proportional to 820,138.30, 1,230,207.45 and 820,138.30

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Solution

The fourth proportional to 820,138.30, 1,230,207.45 and 820,138.30 is: 1,230,207.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,138.30 : 1,230,207.45 = 820,138.30 : x
  2. Step 2: Convert to fraction form
    820,138.30/1,230,207.45 = 820,138.30/x
  3. Step 3: Cross multiply
    820,138.30x = 1,230,207.45 × 820,138.30
  4. Step 4: Simplify right side
    820,138.30x = 1,008,940,246,690.34
  5. Step 5: Solve for x
    x = 1,008,940,246,690.34/820,138.30
  6. Step 6: Final answer
    x = 1,230,207.45

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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.