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Finding the Fourth Proportional to 452.74, 678.48 and 407.78

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Solution

The fourth proportional to 452.74, 678.48 and 407.78 is: 611.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.74 : 678.48 = 407.78 : x
  2. Step 2: Convert to fraction form
    452.74/678.48 = 407.78/x
  3. Step 3: Cross multiply
    452.74x = 678.48 × 407.78
  4. Step 4: Simplify right side
    452.74x = 276,670.57
  5. Step 5: Solve for x
    x = 276,670.57/452.74
  6. Step 6: Final answer
    x = 611.10

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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.