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Finding the Fourth Proportional to 810.78, 1,216.17 and 377.64

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Solution

The fourth proportional to 810.78, 1,216.17 and 377.64 is: 566.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.78 : 1,216.17 = 377.64 : x
  2. Step 2: Convert to fraction form
    810.78/1,216.17 = 377.64/x
  3. Step 3: Cross multiply
    810.78x = 1,216.17 × 377.64
  4. Step 4: Simplify right side
    810.78x = 459,274.44
  5. Step 5: Solve for x
    x = 459,274.44/810.78
  6. Step 6: Final answer
    x = 566.46

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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.