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Finding the Fourth Proportional to 681.45, 940.32 and 515.67

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Solution

The fourth proportional to 681.45, 940.32 and 515.67 is: 711.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.45 : 940.32 = 515.67 : x
  2. Step 2: Convert to fraction form
    681.45/940.32 = 515.67/x
  3. Step 3: Cross multiply
    681.45x = 940.32 × 515.67
  4. Step 4: Simplify right side
    681.45x = 484,894.81
  5. Step 5: Solve for x
    x = 484,894.81/681.45
  6. Step 6: Final answer
    x = 711.56

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1.5x scale

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.