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Finding the Fourth Proportional to 318,978.40, 478,467.60 and 266,879.20

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Solution

The fourth proportional to 318,978.40, 478,467.60 and 266,879.20 is: 400,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,978.40 : 478,467.60 = 266,879.20 : x
  2. Step 2: Convert to fraction form
    318,978.40/478,467.60 = 266,879.20/x
  3. Step 3: Cross multiply
    318,978.40x = 478,467.60 × 266,879.20
  4. Step 4: Simplify right side
    318,978.40x = 127,693,050,313.92
  5. Step 5: Solve for x
    x = 127,693,050,313.92/318,978.40
  6. Step 6: Final answer
    x = 400,318.80

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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.