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Finding the Fourth Proportional to 1,428.46, 1,972.14 and 931.96

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Solution

The fourth proportional to 1,428.46, 1,972.14 and 931.96 is: 1,286.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.46 : 1,972.14 = 931.96 : x
  2. Step 2: Convert to fraction form
    1,428.46/1,972.14 = 931.96/x
  3. Step 3: Cross multiply
    1,428.46x = 1,972.14 × 931.96
  4. Step 4: Simplify right side
    1,428.46x = 1,837,950.93
  5. Step 5: Solve for x
    x = 1,837,950.93/1,428.46
  6. Step 6: Final answer
    x = 1,286.67

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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.