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Finding the Fourth Proportional to 919.06, 1,379.40 and 865.60

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Solution

The fourth proportional to 919.06, 1,379.40 and 865.60 is: 1,299.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.06 : 1,379.40 = 865.60 : x
  2. Step 2: Convert to fraction form
    919.06/1,379.40 = 865.60/x
  3. Step 3: Cross multiply
    919.06x = 1,379.40 × 865.60
  4. Step 4: Simplify right side
    919.06x = 1,194,008.64
  5. Step 5: Solve for x
    x = 1,194,008.64/919.06
  6. Step 6: Final answer
    x = 1,299.16

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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.