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Finding the Fourth Proportional to 1,120.37, 1,680.72 and 340.27

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Solution

The fourth proportional to 1,120.37, 1,680.72 and 340.27 is: 510.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.37 : 1,680.72 = 340.27 : x
  2. Step 2: Convert to fraction form
    1,120.37/1,680.72 = 340.27/x
  3. Step 3: Cross multiply
    1,120.37x = 1,680.72 × 340.27
  4. Step 4: Simplify right side
    1,120.37x = 571,893.12
  5. Step 5: Solve for x
    x = 571,893.12/1,120.37
  6. Step 6: Final answer
    x = 510.45

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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.