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Finding the Fourth Proportional to 520,879.20, 781,318.80 and 310,927.20

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Solution

The fourth proportional to 520,879.20, 781,318.80 and 310,927.20 is: 466,390.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,879.20 : 781,318.80 = 310,927.20 : x
  2. Step 2: Convert to fraction form
    520,879.20/781,318.80 = 310,927.20/x
  3. Step 3: Cross multiply
    520,879.20x = 781,318.80 × 310,927.20
  4. Step 4: Simplify right side
    520,879.20x = 242,933,266,791.36
  5. Step 5: Solve for x
    x = 242,933,266,791.36/520,879.20
  6. Step 6: Final answer
    x = 466,390.80

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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.