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Finding the Fourth Proportional to 529.65, 791.12 and 421.11

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Solution

The fourth proportional to 529.65, 791.12 and 421.11 is: 629.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.65 : 791.12 = 421.11 : x
  2. Step 2: Convert to fraction form
    529.65/791.12 = 421.11/x
  3. Step 3: Cross multiply
    529.65x = 791.12 × 421.11
  4. Step 4: Simplify right side
    529.65x = 333,149.60
  5. Step 5: Solve for x
    x = 333,149.60/529.65
  6. Step 6: Final answer
    x = 629.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.