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Finding the Fourth Proportional to 564.19, 778.59 and 315.50

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Solution

The fourth proportional to 564.19, 778.59 and 315.50 is: 435.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.19 : 778.59 = 315.50 : x
  2. Step 2: Convert to fraction form
    564.19/778.59 = 315.50/x
  3. Step 3: Cross multiply
    564.19x = 778.59 × 315.50
  4. Step 4: Simplify right side
    564.19x = 245,641.25
  5. Step 5: Solve for x
    x = 245,641.25/564.19
  6. Step 6: Final answer
    x = 435.39

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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.