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Finding the Fourth Proportional to 561.37, 842.05 and 253.16

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Solution

The fourth proportional to 561.37, 842.05 and 253.16 is: 379.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.37 : 842.05 = 253.16 : x
  2. Step 2: Convert to fraction form
    561.37/842.05 = 253.16/x
  3. Step 3: Cross multiply
    561.37x = 842.05 × 253.16
  4. Step 4: Simplify right side
    561.37x = 213,172.11
  5. Step 5: Solve for x
    x = 213,172.11/561.37
  6. Step 6: Final answer
    x = 379.74

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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.