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Finding the Fourth Proportional to 518,721.70, 778,082.55 and 308,251.30

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Solution

The fourth proportional to 518,721.70, 778,082.55 and 308,251.30 is: 462,376.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,721.70 : 778,082.55 = 308,251.30 : x
  2. Step 2: Convert to fraction form
    518,721.70/778,082.55 = 308,251.30/x
  3. Step 3: Cross multiply
    518,721.70x = 778,082.55 × 308,251.30
  4. Step 4: Simplify right side
    518,721.70x = 239,844,957,544.82
  5. Step 5: Solve for x
    x = 239,844,957,544.82/518,721.70
  6. Step 6: Final answer
    x = 462,376.95

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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.