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Finding the Fourth Proportional to 719.30, 1,078.07 and 307.57

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Solution

The fourth proportional to 719.30, 1,078.07 and 307.57 is: 460.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.30 : 1,078.07 = 307.57 : x
  2. Step 2: Convert to fraction form
    719.30/1,078.07 = 307.57/x
  3. Step 3: Cross multiply
    719.30x = 1,078.07 × 307.57
  4. Step 4: Simplify right side
    719.30x = 331,577.95
  5. Step 5: Solve for x
    x = 331,577.95/719.30
  6. Step 6: Final answer
    x = 460.97

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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.