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Finding the Fourth Proportional to 678.50, 1,017.75 and 165.50

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Solution

The fourth proportional to 678.50, 1,017.75 and 165.50 is: 248.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.50 : 1,017.75 = 165.50 : x
  2. Step 2: Convert to fraction form
    678.50/1,017.75 = 165.50/x
  3. Step 3: Cross multiply
    678.50x = 1,017.75 × 165.50
  4. Step 4: Simplify right side
    678.50x = 168,437.63
  5. Step 5: Solve for x
    x = 168,437.63/678.50
  6. Step 6: Final answer
    x = 248.25

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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.