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Finding the Fourth Proportional to 1,120.50, 1,680.75 and 351

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Solution

The fourth proportional to 1,120.50, 1,680.75 and 351 is: 526.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.50 : 1,680.75 = 351 : x
  2. Step 2: Convert to fraction form
    1,120.50/1,680.75 = 351/x
  3. Step 3: Cross multiply
    1,120.50x = 1,680.75 × 351
  4. Step 4: Simplify right side
    1,120.50x = 589,943.25
  5. Step 5: Solve for x
    x = 589,943.25/1,120.50
  6. Step 6: Final answer
    x = 526.50

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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.