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Finding the Fourth Proportional to 479,980, 720,086.64 and 147,556

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Solution

The fourth proportional to 479,980, 720,086.64 and 147,556 is: 221,369.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,980 : 720,086.64 = 147,556 : x
  2. Step 2: Convert to fraction form
    479,980/720,086.64 = 147,556/x
  3. Step 3: Cross multiply
    479,980x = 720,086.64 × 147,556
  4. Step 4: Simplify right side
    479,980x = 106,253,104,251.84
  5. Step 5: Solve for x
    x = 106,253,104,251.84/479,980
  6. Step 6: Final answer
    x = 221,369.86

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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.