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Finding the Fourth Proportional to 618.19, 853.10 and 356.22

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Solution

The fourth proportional to 618.19, 853.10 and 356.22 is: 491.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.19 : 853.10 = 356.22 : x
  2. Step 2: Convert to fraction form
    618.19/853.10 = 356.22/x
  3. Step 3: Cross multiply
    618.19x = 853.10 × 356.22
  4. Step 4: Simplify right side
    618.19x = 303,890.84
  5. Step 5: Solve for x
    x = 303,890.84/618.19
  6. Step 6: Final answer
    x = 491.58

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Double scale
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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.