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Finding the Fourth Proportional to 307.71, 424.28 and 285.84

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Solution

The fourth proportional to 307.71, 424.28 and 285.84 is: 394.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.71 : 424.28 = 285.84 : x
  2. Step 2: Convert to fraction form
    307.71/424.28 = 285.84/x
  3. Step 3: Cross multiply
    307.71x = 424.28 × 285.84
  4. Step 4: Simplify right side
    307.71x = 121,276.91
  5. Step 5: Solve for x
    x = 121,276.91/307.71
  6. Step 6: Final answer
    x = 394.13

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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.