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Finding the Fourth Proportional to 307.15, 460.85 and 142.70

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Solution

The fourth proportional to 307.15, 460.85 and 142.70 is: 214.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.15 : 460.85 = 142.70 : x
  2. Step 2: Convert to fraction form
    307.15/460.85 = 142.70/x
  3. Step 3: Cross multiply
    307.15x = 460.85 × 142.70
  4. Step 4: Simplify right side
    307.15x = 65,763.30
  5. Step 5: Solve for x
    x = 65,763.30/307.15
  6. Step 6: Final answer
    x = 214.11

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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.