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Finding the Fourth Proportional to 608.09, 839.34 and 421.58

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Solution

The fourth proportional to 608.09, 839.34 and 421.58 is: 581.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.09 : 839.34 = 421.58 : x
  2. Step 2: Convert to fraction form
    608.09/839.34 = 421.58/x
  3. Step 3: Cross multiply
    608.09x = 839.34 × 421.58
  4. Step 4: Simplify right side
    608.09x = 353,851.06
  5. Step 5: Solve for x
    x = 353,851.06/608.09
  6. Step 6: Final answer
    x = 581.91

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1.5x scale

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.