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Finding the Fourth Proportional to 1,120.80, 1,680.72 and 350.88

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Solution

The fourth proportional to 1,120.80, 1,680.72 and 350.88 is: 526.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.80 : 1,680.72 = 350.88 : x
  2. Step 2: Convert to fraction form
    1,120.80/1,680.72 = 350.88/x
  3. Step 3: Cross multiply
    1,120.80x = 1,680.72 × 350.88
  4. Step 4: Simplify right side
    1,120.80x = 589,731.03
  5. Step 5: Solve for x
    x = 589,731.03/1,120.80
  6. Step 6: Final answer
    x = 526.17

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1.5x scale

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.