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Finding the Fourth Proportional to 211,978.20, 318,485.70 and 159,490.20

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Solution

The fourth proportional to 211,978.20, 318,485.70 and 159,490.20 is: 239,625.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,978.20 : 318,485.70 = 159,490.20 : x
  2. Step 2: Convert to fraction form
    211,978.20/318,485.70 = 159,490.20/x
  3. Step 3: Cross multiply
    211,978.20x = 318,485.70 × 159,490.20
  4. Step 4: Simplify right side
    211,978.20x = 50,795,347,990.14
  5. Step 5: Solve for x
    x = 50,795,347,990.14/211,978.20
  6. Step 6: Final answer
    x = 239,625.34

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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.