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Finding the Fourth Proportional to 718.56, 1,078.25 and 307.67

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Solution

The fourth proportional to 718.56, 1,078.25 and 307.67 is: 461.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.56 : 1,078.25 = 307.67 : x
  2. Step 2: Convert to fraction form
    718.56/1,078.25 = 307.67/x
  3. Step 3: Cross multiply
    718.56x = 1,078.25 × 307.67
  4. Step 4: Simplify right side
    718.56x = 331,738.25
  5. Step 5: Solve for x
    x = 331,738.25/718.56
  6. Step 6: Final answer
    x = 461.67

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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.