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Finding the Fourth Proportional to 561.72, 842.75 and 253.49

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Solution

The fourth proportional to 561.72, 842.75 and 253.49 is: 380.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.72 : 842.75 = 253.49 : x
  2. Step 2: Convert to fraction form
    561.72/842.75 = 253.49/x
  3. Step 3: Cross multiply
    561.72x = 842.75 × 253.49
  4. Step 4: Simplify right side
    561.72x = 213,631.52
  5. Step 5: Solve for x
    x = 213,631.52/561.72
  6. Step 6: Final answer
    x = 380.32

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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.