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Finding the Fourth Proportional to 919.50, 1,370.38 and 911.84

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Solution

The fourth proportional to 919.50, 1,370.38 and 911.84 is: 1,358.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.50 : 1,370.38 = 911.84 : x
  2. Step 2: Convert to fraction form
    919.50/1,370.38 = 911.84/x
  3. Step 3: Cross multiply
    919.50x = 1,370.38 × 911.84
  4. Step 4: Simplify right side
    919.50x = 1,249,567.30
  5. Step 5: Solve for x
    x = 1,249,567.30/919.50
  6. Step 6: Final answer
    x = 1,358.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.