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Finding the Fourth Proportional to 307.13, 422.99 and 285.60

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Solution

The fourth proportional to 307.13, 422.99 and 285.60 is: 393.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.13 : 422.99 = 285.60 : x
  2. Step 2: Convert to fraction form
    307.13/422.99 = 285.60/x
  3. Step 3: Cross multiply
    307.13x = 422.99 × 285.60
  4. Step 4: Simplify right side
    307.13x = 120,807.17
  5. Step 5: Solve for x
    x = 120,807.17/307.13
  6. Step 6: Final answer
    x = 393.35

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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.