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Finding the Fourth Proportional to 917.88, 1,379.34 and 485.34

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Solution

The fourth proportional to 917.88, 1,379.34 and 485.34 is: 729.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.88 : 1,379.34 = 485.34 : x
  2. Step 2: Convert to fraction form
    917.88/1,379.34 = 485.34/x
  3. Step 3: Cross multiply
    917.88x = 1,379.34 × 485.34
  4. Step 4: Simplify right side
    917.88x = 669,448.88
  5. Step 5: Solve for x
    x = 669,448.88/917.88
  6. Step 6: Final answer
    x = 729.34

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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.