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Finding the Fourth Proportional to 561.19, 842.19 and 318.19

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Solution

The fourth proportional to 561.19, 842.19 and 318.19 is: 477.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.19 : 842.19 = 318.19 : x
  2. Step 2: Convert to fraction form
    561.19/842.19 = 318.19/x
  3. Step 3: Cross multiply
    561.19x = 842.19 × 318.19
  4. Step 4: Simplify right side
    561.19x = 267,972.23
  5. Step 5: Solve for x
    x = 267,972.23/561.19
  6. Step 6: Final answer
    x = 477.51

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Double scale
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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.