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Finding the Fourth Proportional to 862.19, 1,291.71 and 554.09

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Solution

The fourth proportional to 862.19, 1,291.71 and 554.09 is: 830.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.19 : 1,291.71 = 554.09 : x
  2. Step 2: Convert to fraction form
    862.19/1,291.71 = 554.09/x
  3. Step 3: Cross multiply
    862.19x = 1,291.71 × 554.09
  4. Step 4: Simplify right side
    862.19x = 715,717.14
  5. Step 5: Solve for x
    x = 715,717.14/862.19
  6. Step 6: Final answer
    x = 830.11

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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.