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Finding the Fourth Proportional to 618.75, 853.74 and 356.76

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Solution

The fourth proportional to 618.75, 853.74 and 356.76 is: 492.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.75 : 853.74 = 356.76 : x
  2. Step 2: Convert to fraction form
    618.75/853.74 = 356.76/x
  3. Step 3: Cross multiply
    618.75x = 853.74 × 356.76
  4. Step 4: Simplify right side
    618.75x = 304,580.28
  5. Step 5: Solve for x
    x = 304,580.28/618.75
  6. Step 6: Final answer
    x = 492.25

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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.