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Finding the Fourth Proportional to 813,000.80, 1,219,630.80 and 339,442.40

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Solution

The fourth proportional to 813,000.80, 1,219,630.80 and 339,442.40 is: 509,217.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,000.80 : 1,219,630.80 = 339,442.40 : x
  2. Step 2: Convert to fraction form
    813,000.80/1,219,630.80 = 339,442.40/x
  3. Step 3: Cross multiply
    813,000.80x = 1,219,630.80 × 339,442.40
  4. Step 4: Simplify right side
    813,000.80x = 413,994,405,865.92
  5. Step 5: Solve for x
    x = 413,994,405,865.92/813,000.80
  6. Step 6: Final answer
    x = 509,217.71

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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.