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Finding the Fourth Proportional to 611.40, 842.76 and 480.18

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Solution

The fourth proportional to 611.40, 842.76 and 480.18 is: 661.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.40 : 842.76 = 480.18 : x
  2. Step 2: Convert to fraction form
    611.40/842.76 = 480.18/x
  3. Step 3: Cross multiply
    611.40x = 842.76 × 480.18
  4. Step 4: Simplify right side
    611.40x = 404,676.50
  5. Step 5: Solve for x
    x = 404,676.50/611.40
  6. Step 6: Final answer
    x = 661.89

Related Problems

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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.