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Finding the Fourth Proportional to 608.00, 838.55 and 421.45

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Solution

The fourth proportional to 608.00, 838.55 and 421.45 is: 581.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.00 : 838.55 = 421.45 : x
  2. Step 2: Convert to fraction form
    608.00/838.55 = 421.45/x
  3. Step 3: Cross multiply
    608.00x = 838.55 × 421.45
  4. Step 4: Simplify right side
    608.00x = 353,405.85
  5. Step 5: Solve for x
    x = 353,405.85/608.00
  6. Step 6: Final answer
    x = 581.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.