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Finding the Fourth Proportional to 452.81, 678.65 and 257.67

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Solution

The fourth proportional to 452.81, 678.65 and 257.67 is: 386.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.81 : 678.65 = 257.67 : x
  2. Step 2: Convert to fraction form
    452.81/678.65 = 257.67/x
  3. Step 3: Cross multiply
    452.81x = 678.65 × 257.67
  4. Step 4: Simplify right side
    452.81x = 174,866.46
  5. Step 5: Solve for x
    x = 174,866.46/452.81
  6. Step 6: Final answer
    x = 386.18

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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.