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Finding the Fourth Proportional to 561.65, 842.70 and 253.64

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Solution

The fourth proportional to 561.65, 842.70 and 253.64 is: 380.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.65 : 842.70 = 253.64 : x
  2. Step 2: Convert to fraction form
    561.65/842.70 = 253.64/x
  3. Step 3: Cross multiply
    561.65x = 842.70 × 253.64
  4. Step 4: Simplify right side
    561.65x = 213,742.43
  5. Step 5: Solve for x
    x = 213,742.43/561.65
  6. Step 6: Final answer
    x = 380.56

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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.