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Finding the Fourth Proportional to 618.77, 928.19 and 253.46

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Solution

The fourth proportional to 618.77, 928.19 and 253.46 is: 380.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.77 : 928.19 = 253.46 : x
  2. Step 2: Convert to fraction form
    618.77/928.19 = 253.46/x
  3. Step 3: Cross multiply
    618.77x = 928.19 × 253.46
  4. Step 4: Simplify right side
    618.77x = 235,261.99
  5. Step 5: Solve for x
    x = 235,261.99/618.77
  6. Step 6: Final answer
    x = 380.21

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Similar ratio
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1.5x scale

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.