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Finding the Fourth Proportional to 266,145.40, 399,218.10 and 79,132.60

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Solution

The fourth proportional to 266,145.40, 399,218.10 and 79,132.60 is: 118,698.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,145.40 : 399,218.10 = 79,132.60 : x
  2. Step 2: Convert to fraction form
    266,145.40/399,218.10 = 79,132.60/x
  3. Step 3: Cross multiply
    266,145.40x = 399,218.10 × 79,132.60
  4. Step 4: Simplify right side
    266,145.40x = 31,591,166,220.06
  5. Step 5: Solve for x
    x = 31,591,166,220.06/266,145.40
  6. Step 6: Final answer
    x = 118,698.90

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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.