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Finding the Fourth Proportional to 675.45, 931.95 and 391.86

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Solution

The fourth proportional to 675.45, 931.95 and 391.86 is: 540.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.45 : 931.95 = 391.86 : x
  2. Step 2: Convert to fraction form
    675.45/931.95 = 391.86/x
  3. Step 3: Cross multiply
    675.45x = 931.95 × 391.86
  4. Step 4: Simplify right side
    675.45x = 365,193.93
  5. Step 5: Solve for x
    x = 365,193.93/675.45
  6. Step 6: Final answer
    x = 540.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.