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Finding the Fourth Proportional to 519,321.20, 778,981.80 and 219,702.20

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Solution

The fourth proportional to 519,321.20, 778,981.80 and 219,702.20 is: 329,553.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,321.20 : 778,981.80 = 219,702.20 : x
  2. Step 2: Convert to fraction form
    519,321.20/778,981.80 = 219,702.20/x
  3. Step 3: Cross multiply
    519,321.20x = 778,981.80 × 219,702.20
  4. Step 4: Simplify right side
    519,321.20x = 171,144,015,219.96
  5. Step 5: Solve for x
    x = 171,144,015,219.96/519,321.20
  6. Step 6: Final answer
    x = 329,553.30

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Double scale
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Similar ratio
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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.