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Finding the Fourth Proportional to 519,208.40, 778,812.60 and 318,879.20

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Solution

The fourth proportional to 519,208.40, 778,812.60 and 318,879.20 is: 478,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,208.40 : 778,812.60 = 318,879.20 : x
  2. Step 2: Convert to fraction form
    519,208.40/778,812.60 = 318,879.20/x
  3. Step 3: Cross multiply
    519,208.40x = 778,812.60 × 318,879.20
  4. Step 4: Simplify right side
    519,208.40x = 248,347,138,837.92
  5. Step 5: Solve for x
    x = 248,347,138,837.92/519,208.40
  6. Step 6: Final answer
    x = 478,318.80

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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.