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Finding the Fourth Proportional to 917.76, 1,375.20 and 845.76

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Solution

The fourth proportional to 917.76, 1,375.20 and 845.76 is: 1,267.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.76 : 1,375.20 = 845.76 : x
  2. Step 2: Convert to fraction form
    917.76/1,375.20 = 845.76/x
  3. Step 3: Cross multiply
    917.76x = 1,375.20 × 845.76
  4. Step 4: Simplify right side
    917.76x = 1,163,089.15
  5. Step 5: Solve for x
    x = 1,163,089.15/917.76
  6. Step 6: Final answer
    x = 1,267.31

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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.