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Finding the Fourth Proportional to 958.70, 1,438.65 and 913.76

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Solution

The fourth proportional to 958.70, 1,438.65 and 913.76 is: 1,371.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.70 : 1,438.65 = 913.76 : x
  2. Step 2: Convert to fraction form
    958.70/1,438.65 = 913.76/x
  3. Step 3: Cross multiply
    958.70x = 1,438.65 × 913.76
  4. Step 4: Simplify right side
    958.70x = 1,314,580.82
  5. Step 5: Solve for x
    x = 1,314,580.82/958.70
  6. Step 6: Final answer
    x = 1,371.21

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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.