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Finding the Fourth Proportional to 438.19, 605.09 and 320.83

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Solution

The fourth proportional to 438.19, 605.09 and 320.83 is: 443.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.19 : 605.09 = 320.83 : x
  2. Step 2: Convert to fraction form
    438.19/605.09 = 320.83/x
  3. Step 3: Cross multiply
    438.19x = 605.09 × 320.83
  4. Step 4: Simplify right side
    438.19x = 194,131.02
  5. Step 5: Solve for x
    x = 194,131.02/438.19
  6. Step 6: Final answer
    x = 443.03

Related Problems

Find fourth proportional to 219.10, 302.55 and 160.42
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Double scale
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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.