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Finding the Fourth Proportional to 2,124.70, 3,202.82 and 1,980.70

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Solution

The fourth proportional to 2,124.70, 3,202.82 and 1,980.70 is: 2,985.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,124.70 : 3,202.82 = 1,980.70 : x
  2. Step 2: Convert to fraction form
    2,124.70/3,202.82 = 1,980.70/x
  3. Step 3: Cross multiply
    2,124.70x = 3,202.82 × 1,980.70
  4. Step 4: Simplify right side
    2,124.70x = 6,343,825.57
  5. Step 5: Solve for x
    x = 6,343,825.57/2,124.70
  6. Step 6: Final answer
    x = 2,985.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.