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Finding the Fourth Proportional to 520,400.20, 780,081.90 and 239,427.40

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Solution

The fourth proportional to 520,400.20, 780,081.90 and 239,427.40 is: 358,902.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,400.20 : 780,081.90 = 239,427.40 : x
  2. Step 2: Convert to fraction form
    520,400.20/780,081.90 = 239,427.40/x
  3. Step 3: Cross multiply
    520,400.20x = 780,081.90 × 239,427.40
  4. Step 4: Simplify right side
    520,400.20x = 186,772,981,104.06
  5. Step 5: Solve for x
    x = 186,772,981,104.06/520,400.20
  6. Step 6: Final answer
    x = 358,902.59

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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.