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Finding the Fourth Proportional to 561.76, 775.18 and 313.04

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Solution

The fourth proportional to 561.76, 775.18 and 313.04 is: 431.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.76 : 775.18 = 313.04 : x
  2. Step 2: Convert to fraction form
    561.76/775.18 = 313.04/x
  3. Step 3: Cross multiply
    561.76x = 775.18 × 313.04
  4. Step 4: Simplify right side
    561.76x = 242,662.35
  5. Step 5: Solve for x
    x = 242,662.35/561.76
  6. Step 6: Final answer
    x = 431.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.