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Finding the Fourth Proportional to 404.70, 607.20 and 130.80

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Solution

The fourth proportional to 404.70, 607.20 and 130.80 is: 196.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.70 : 607.20 = 130.80 : x
  2. Step 2: Convert to fraction form
    404.70/607.20 = 130.80/x
  3. Step 3: Cross multiply
    404.70x = 607.20 × 130.80
  4. Step 4: Simplify right side
    404.70x = 79,421.76
  5. Step 5: Solve for x
    x = 79,421.76/404.70
  6. Step 6: Final answer
    x = 196.25

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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.