Home / 1,120.16-1,680.14-757.28

Finding the Fourth Proportional to 1,120.16, 1,680.14 and 757.28

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Solution

The fourth proportional to 1,120.16, 1,680.14 and 757.28 is: 1,135.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.16 : 1,680.14 = 757.28 : x
  2. Step 2: Convert to fraction form
    1,120.16/1,680.14 = 757.28/x
  3. Step 3: Cross multiply
    1,120.16x = 1,680.14 × 757.28
  4. Step 4: Simplify right side
    1,120.16x = 1,272,336.42
  5. Step 5: Solve for x
    x = 1,272,336.42/1,120.16
  6. Step 6: Final answer
    x = 1,135.85

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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.