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Finding the Fourth Proportional to 266,139.80, 399,209.70 and 218,900.60

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Solution

The fourth proportional to 266,139.80, 399,209.70 and 218,900.60 is: 328,350.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,139.80 : 399,209.70 = 218,900.60 : x
  2. Step 2: Convert to fraction form
    266,139.80/399,209.70 = 218,900.60/x
  3. Step 3: Cross multiply
    266,139.80x = 399,209.70 × 218,900.60
  4. Step 4: Simplify right side
    266,139.80x = 87,387,242,855.82
  5. Step 5: Solve for x
    x = 87,387,242,855.82/266,139.80
  6. Step 6: Final answer
    x = 328,350.90

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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.