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Finding the Fourth Proportional to 917.72, 1,376.78 and 332.76

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Solution

The fourth proportional to 917.72, 1,376.78 and 332.76 is: 499.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.72 : 1,376.78 = 332.76 : x
  2. Step 2: Convert to fraction form
    917.72/1,376.78 = 332.76/x
  3. Step 3: Cross multiply
    917.72x = 1,376.78 × 332.76
  4. Step 4: Simplify right side
    917.72x = 458,137.31
  5. Step 5: Solve for x
    x = 458,137.31/917.72
  6. Step 6: Final answer
    x = 499.21

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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.