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Finding the Fourth Proportional to 561.27, 774.55 and 312.59

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Solution

The fourth proportional to 561.27, 774.55 and 312.59 is: 431.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.27 : 774.55 = 312.59 : x
  2. Step 2: Convert to fraction form
    561.27/774.55 = 312.59/x
  3. Step 3: Cross multiply
    561.27x = 774.55 × 312.59
  4. Step 4: Simplify right side
    561.27x = 242,111.93
  5. Step 5: Solve for x
    x = 242,111.93/561.27
  6. Step 6: Final answer
    x = 431.36

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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.