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Finding the Fourth Proportional to 2,840.62, 3,920.53 and 1,645.40

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Solution

The fourth proportional to 2,840.62, 3,920.53 and 1,645.40 is: 2,270.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,840.62 : 3,920.53 = 1,645.40 : x
  2. Step 2: Convert to fraction form
    2,840.62/3,920.53 = 1,645.40/x
  3. Step 3: Cross multiply
    2,840.62x = 3,920.53 × 1,645.40
  4. Step 4: Simplify right side
    2,840.62x = 6,450,838.69
  5. Step 5: Solve for x
    x = 6,450,838.69/2,840.62
  6. Step 6: Final answer
    x = 2,270.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.