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Finding the Fourth Proportional to 816.01, 1,223.38 and 425.77

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Solution

The fourth proportional to 816.01, 1,223.38 and 425.77 is: 638.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.01 : 1,223.38 = 425.77 : x
  2. Step 2: Convert to fraction form
    816.01/1,223.38 = 425.77/x
  3. Step 3: Cross multiply
    816.01x = 1,223.38 × 425.77
  4. Step 4: Simplify right side
    816.01x = 520,878.50
  5. Step 5: Solve for x
    x = 520,878.50/816.01
  6. Step 6: Final answer
    x = 638.32

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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.