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Finding the Fourth Proportional to 917.40, 1,376.76 and 369.73

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Solution

The fourth proportional to 917.40, 1,376.76 and 369.73 is: 554.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.40 : 1,376.76 = 369.73 : x
  2. Step 2: Convert to fraction form
    917.40/1,376.76 = 369.73/x
  3. Step 3: Cross multiply
    917.40x = 1,376.76 × 369.73
  4. Step 4: Simplify right side
    917.40x = 509,029.47
  5. Step 5: Solve for x
    x = 509,029.47/917.40
  6. Step 6: Final answer
    x = 554.86

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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.