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Finding the Fourth Proportional to 1,120.32, 1,680.28 and 340.28

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Solution

The fourth proportional to 1,120.32, 1,680.28 and 340.28 is: 510.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.32 : 1,680.28 = 340.28 : x
  2. Step 2: Convert to fraction form
    1,120.32/1,680.28 = 340.28/x
  3. Step 3: Cross multiply
    1,120.32x = 1,680.28 × 340.28
  4. Step 4: Simplify right side
    1,120.32x = 571,765.68
  5. Step 5: Solve for x
    x = 571,765.68/1,120.32
  6. Step 6: Final answer
    x = 510.36

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Double scale
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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.