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Finding the Fourth Proportional to 917.45, 1,376.82 and 340.81

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Solution

The fourth proportional to 917.45, 1,376.82 and 340.81 is: 511.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.45 : 1,376.82 = 340.81 : x
  2. Step 2: Convert to fraction form
    917.45/1,376.82 = 340.81/x
  3. Step 3: Cross multiply
    917.45x = 1,376.82 × 340.81
  4. Step 4: Simplify right side
    917.45x = 469,234.02
  5. Step 5: Solve for x
    x = 469,234.02/917.45
  6. Step 6: Final answer
    x = 511.45

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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.