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Finding the Fourth Proportional to 407.78, 610.94 and 253.63

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Solution

The fourth proportional to 407.78, 610.94 and 253.63 is: 379.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.78 : 610.94 = 253.63 : x
  2. Step 2: Convert to fraction form
    407.78/610.94 = 253.63/x
  3. Step 3: Cross multiply
    407.78x = 610.94 × 253.63
  4. Step 4: Simplify right side
    407.78x = 154,954.11
  5. Step 5: Solve for x
    x = 154,954.11/407.78
  6. Step 6: Final answer
    x = 379.99

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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.