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Finding the Fourth Proportional to 613.74, 920.60 and 354

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Solution

The fourth proportional to 613.74, 920.60 and 354 is: 530.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.74 : 920.60 = 354 : x
  2. Step 2: Convert to fraction form
    613.74/920.60 = 354/x
  3. Step 3: Cross multiply
    613.74x = 920.60 × 354
  4. Step 4: Simplify right side
    613.74x = 325,892.40
  5. Step 5: Solve for x
    x = 325,892.40/613.74
  6. Step 6: Final answer
    x = 530.99

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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.