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Finding the Fourth Proportional to 1,980.78, 2,972.61 and 955.50

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Solution

The fourth proportional to 1,980.78, 2,972.61 and 955.50 is: 1,433.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.78 : 2,972.61 = 955.50 : x
  2. Step 2: Convert to fraction form
    1,980.78/2,972.61 = 955.50/x
  3. Step 3: Cross multiply
    1,980.78x = 2,972.61 × 955.50
  4. Step 4: Simplify right side
    1,980.78x = 2,840,328.86
  5. Step 5: Solve for x
    x = 2,840,328.86/1,980.78
  6. Step 6: Final answer
    x = 1,433.94

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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.