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Finding the Fourth Proportional to 561.21, 840.30 and 365.63

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Solution

The fourth proportional to 561.21, 840.30 and 365.63 is: 547.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.21 : 840.30 = 365.63 : x
  2. Step 2: Convert to fraction form
    561.21/840.30 = 365.63/x
  3. Step 3: Cross multiply
    561.21x = 840.30 × 365.63
  4. Step 4: Simplify right side
    561.21x = 307,234.69
  5. Step 5: Solve for x
    x = 307,234.69/561.21
  6. Step 6: Final answer
    x = 547.45

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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.