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Finding the Fourth Proportional to 2,778.90, 4,168.35 and 929.67

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Solution

The fourth proportional to 2,778.90, 4,168.35 and 929.67 is: 1,394.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778.90 : 4,168.35 = 929.67 : x
  2. Step 2: Convert to fraction form
    2,778.90/4,168.35 = 929.67/x
  3. Step 3: Cross multiply
    2,778.90x = 4,168.35 × 929.67
  4. Step 4: Simplify right side
    2,778.90x = 3,875,189.94
  5. Step 5: Solve for x
    x = 3,875,189.94/2,778.90
  6. Step 6: Final answer
    x = 1,394.51

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1.5x scale

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.