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Finding the Fourth Proportional to 1,758.79, 2,638.09 and 526.21

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Solution

The fourth proportional to 1,758.79, 2,638.09 and 526.21 is: 789.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,758.79 : 2,638.09 = 526.21 : x
  2. Step 2: Convert to fraction form
    1,758.79/2,638.09 = 526.21/x
  3. Step 3: Cross multiply
    1,758.79x = 2,638.09 × 526.21
  4. Step 4: Simplify right side
    1,758.79x = 1,388,189.34
  5. Step 5: Solve for x
    x = 1,388,189.34/1,758.79
  6. Step 6: Final answer
    x = 789.29

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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.