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Finding the Fourth Proportional to 917.91, 1,376.78 and 369.72

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Solution

The fourth proportional to 917.91, 1,376.78 and 369.72 is: 554.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.91 : 1,376.78 = 369.72 : x
  2. Step 2: Convert to fraction form
    917.91/1,376.78 = 369.72/x
  3. Step 3: Cross multiply
    917.91x = 1,376.78 × 369.72
  4. Step 4: Simplify right side
    917.91x = 509,021.25
  5. Step 5: Solve for x
    x = 509,021.25/917.91
  6. Step 6: Final answer
    x = 554.54

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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.