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Finding the Fourth Proportional to 1,299.64, 1,949.94 and 780.01

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Solution

The fourth proportional to 1,299.64, 1,949.94 and 780.01 is: 1,170.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.64 : 1,949.94 = 780.01 : x
  2. Step 2: Convert to fraction form
    1,299.64/1,949.94 = 780.01/x
  3. Step 3: Cross multiply
    1,299.64x = 1,949.94 × 780.01
  4. Step 4: Simplify right side
    1,299.64x = 1,520,970.75
  5. Step 5: Solve for x
    x = 1,520,970.75/1,299.64
  6. Step 6: Final answer
    x = 1,170.31

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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.