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Finding the Fourth Proportional to 561.91, 775.47 and 313.23

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Solution

The fourth proportional to 561.91, 775.47 and 313.23 is: 432.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.91 : 775.47 = 313.23 : x
  2. Step 2: Convert to fraction form
    561.91/775.47 = 313.23/x
  3. Step 3: Cross multiply
    561.91x = 775.47 × 313.23
  4. Step 4: Simplify right side
    561.91x = 242,901.64
  5. Step 5: Solve for x
    x = 242,901.64/561.91
  6. Step 6: Final answer
    x = 432.28

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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.