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Finding the Fourth Proportional to 1,980.81, 2,971.62 and 749.07

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Solution

The fourth proportional to 1,980.81, 2,971.62 and 749.07 is: 1,123.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.81 : 2,971.62 = 749.07 : x
  2. Step 2: Convert to fraction form
    1,980.81/2,971.62 = 749.07/x
  3. Step 3: Cross multiply
    1,980.81x = 2,971.62 × 749.07
  4. Step 4: Simplify right side
    1,980.81x = 2,225,951.39
  5. Step 5: Solve for x
    x = 2,225,951.39/1,980.81
  6. Step 6: Final answer
    x = 1,123.76

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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.