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Finding the Fourth Proportional to 555.39, 766.26 and 319.28

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Solution

The fourth proportional to 555.39, 766.26 and 319.28 is: 440.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.39 : 766.26 = 319.28 : x
  2. Step 2: Convert to fraction form
    555.39/766.26 = 319.28/x
  3. Step 3: Cross multiply
    555.39x = 766.26 × 319.28
  4. Step 4: Simplify right side
    555.39x = 244,647.66
  5. Step 5: Solve for x
    x = 244,647.66/555.39
  6. Step 6: Final answer
    x = 440.50

Related Problems

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.