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Finding the Fourth Proportional to 561.20, 841.60 and 214.59

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Solution

The fourth proportional to 561.20, 841.60 and 214.59 is: 321.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.20 : 841.60 = 214.59 : x
  2. Step 2: Convert to fraction form
    561.20/841.60 = 214.59/x
  3. Step 3: Cross multiply
    561.20x = 841.60 × 214.59
  4. Step 4: Simplify right side
    561.20x = 180,598.41
  5. Step 5: Solve for x
    x = 180,598.41/561.20
  6. Step 6: Final answer
    x = 321.81

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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.