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Finding the Fourth Proportional to 816.04, 1,223.34 and 430.12

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Solution

The fourth proportional to 816.04, 1,223.34 and 430.12 is: 644.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.04 : 1,223.34 = 430.12 : x
  2. Step 2: Convert to fraction form
    816.04/1,223.34 = 430.12/x
  3. Step 3: Cross multiply
    816.04x = 1,223.34 × 430.12
  4. Step 4: Simplify right side
    816.04x = 526,183.00
  5. Step 5: Solve for x
    x = 526,183.00/816.04
  6. Step 6: Final answer
    x = 644.80

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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.