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Finding the Fourth Proportional to 1,980.28, 2,970.58 and 663.98

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Solution

The fourth proportional to 1,980.28, 2,970.58 and 663.98 is: 996.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.28 : 2,970.58 = 663.98 : x
  2. Step 2: Convert to fraction form
    1,980.28/2,970.58 = 663.98/x
  3. Step 3: Cross multiply
    1,980.28x = 2,970.58 × 663.98
  4. Step 4: Simplify right side
    1,980.28x = 1,972,405.71
  5. Step 5: Solve for x
    x = 1,972,405.71/1,980.28
  6. Step 6: Final answer
    x = 996.02

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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.