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Finding the Fourth Proportional to 561.16, 841.20 and 378.15

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Solution

The fourth proportional to 561.16, 841.20 and 378.15 is: 566.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.16 : 841.20 = 378.15 : x
  2. Step 2: Convert to fraction form
    561.16/841.20 = 378.15/x
  3. Step 3: Cross multiply
    561.16x = 841.20 × 378.15
  4. Step 4: Simplify right side
    561.16x = 318,099.78
  5. Step 5: Solve for x
    x = 318,099.78/561.16
  6. Step 6: Final answer
    x = 566.86

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Double scale
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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.