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Finding the Fourth Proportional to 462.50, 638.28 and 307.28

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Solution

The fourth proportional to 462.50, 638.28 and 307.28 is: 424.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.50 : 638.28 = 307.28 : x
  2. Step 2: Convert to fraction form
    462.50/638.28 = 307.28/x
  3. Step 3: Cross multiply
    462.50x = 638.28 × 307.28
  4. Step 4: Simplify right side
    462.50x = 196,130.68
  5. Step 5: Solve for x
    x = 196,130.68/462.50
  6. Step 6: Final answer
    x = 424.07

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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.