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Finding the Fourth Proportional to 555.34, 766.38 and 319.30

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Solution

The fourth proportional to 555.34, 766.38 and 319.30 is: 440.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.34 : 766.38 = 319.30 : x
  2. Step 2: Convert to fraction form
    555.34/766.38 = 319.30/x
  3. Step 3: Cross multiply
    555.34x = 766.38 × 319.30
  4. Step 4: Simplify right side
    555.34x = 244,705.13
  5. Step 5: Solve for x
    x = 244,705.13/555.34
  6. Step 6: Final answer
    x = 440.64

Related Problems

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Half scale
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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.