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Finding the Fourth Proportional to 307.61, 424.47 and 285.27

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Solution

The fourth proportional to 307.61, 424.47 and 285.27 is: 393.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.61 : 424.47 = 285.27 : x
  2. Step 2: Convert to fraction form
    307.61/424.47 = 285.27/x
  3. Step 3: Cross multiply
    307.61x = 424.47 × 285.27
  4. Step 4: Simplify right side
    307.61x = 121,088.56
  5. Step 5: Solve for x
    x = 121,088.56/307.61
  6. Step 6: Final answer
    x = 393.64

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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.