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Finding the Fourth Proportional to 815.19, 1,223.04 and 259.98

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Solution

The fourth proportional to 815.19, 1,223.04 and 259.98 is: 390.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.19 : 1,223.04 = 259.98 : x
  2. Step 2: Convert to fraction form
    815.19/1,223.04 = 259.98/x
  3. Step 3: Cross multiply
    815.19x = 1,223.04 × 259.98
  4. Step 4: Simplify right side
    815.19x = 317,965.94
  5. Step 5: Solve for x
    x = 317,965.94/815.19
  6. Step 6: Final answer
    x = 390.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.