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Finding the Fourth Proportional to 561.72, 775.11 and 313.02

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Solution

The fourth proportional to 561.72, 775.11 and 313.02 is: 431.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.72 : 775.11 = 313.02 : x
  2. Step 2: Convert to fraction form
    561.72/775.11 = 313.02/x
  3. Step 3: Cross multiply
    561.72x = 775.11 × 313.02
  4. Step 4: Simplify right side
    561.72x = 242,624.93
  5. Step 5: Solve for x
    x = 242,624.93/561.72
  6. Step 6: Final answer
    x = 431.93

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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.