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Finding the Fourth Proportional to 919.38, 1,269.63 and 787.62

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Solution

The fourth proportional to 919.38, 1,269.63 and 787.62 is: 1,087.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.38 : 1,269.63 = 787.62 : x
  2. Step 2: Convert to fraction form
    919.38/1,269.63 = 787.62/x
  3. Step 3: Cross multiply
    919.38x = 1,269.63 × 787.62
  4. Step 4: Simplify right side
    919.38x = 999,985.98
  5. Step 5: Solve for x
    x = 999,985.98/919.38
  6. Step 6: Final answer
    x = 1,087.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.