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Finding the Fourth Proportional to 561.98, 775.53 and 313.31

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Solution

The fourth proportional to 561.98, 775.53 and 313.31 is: 432.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.98 : 775.53 = 313.31 : x
  2. Step 2: Convert to fraction form
    561.98/775.53 = 313.31/x
  3. Step 3: Cross multiply
    561.98x = 775.53 × 313.31
  4. Step 4: Simplify right side
    561.98x = 242,977.43
  5. Step 5: Solve for x
    x = 242,977.43/561.98
  6. Step 6: Final answer
    x = 432.36

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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.