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Finding the Fourth Proportional to 555.38, 766.40 and 303.30

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Solution

The fourth proportional to 555.38, 766.40 and 303.30 is: 418.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.38 : 766.40 = 303.30 : x
  2. Step 2: Convert to fraction form
    555.38/766.40 = 303.30/x
  3. Step 3: Cross multiply
    555.38x = 766.40 × 303.30
  4. Step 4: Simplify right side
    555.38x = 232,449.88
  5. Step 5: Solve for x
    x = 232,449.88/555.38
  6. Step 6: Final answer
    x = 418.55

Related Problems

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Double scale
Find fourth proportional to 556.38, 767.78 and 304.30
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.