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Finding the Fourth Proportional to 618.69, 928.34 and 253.59

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Solution

The fourth proportional to 618.69, 928.34 and 253.59 is: 380.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.69 : 928.34 = 253.59 : x
  2. Step 2: Convert to fraction form
    618.69/928.34 = 253.59/x
  3. Step 3: Cross multiply
    618.69x = 928.34 × 253.59
  4. Step 4: Simplify right side
    618.69x = 235,417.74
  5. Step 5: Solve for x
    x = 235,417.74/618.69
  6. Step 6: Final answer
    x = 380.51

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Double scale
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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.