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Finding the Fourth Proportional to 1,169.34, 1,751.68 and 778.15

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Solution

The fourth proportional to 1,169.34, 1,751.68 and 778.15 is: 1,165.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.34 : 1,751.68 = 778.15 : x
  2. Step 2: Convert to fraction form
    1,169.34/1,751.68 = 778.15/x
  3. Step 3: Cross multiply
    1,169.34x = 1,751.68 × 778.15
  4. Step 4: Simplify right side
    1,169.34x = 1,363,069.79
  5. Step 5: Solve for x
    x = 1,363,069.79/1,169.34
  6. Step 6: Final answer
    x = 1,165.67

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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.