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Finding the Fourth Proportional to 1,029.06, 1,419.75 and 780.12

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Solution

The fourth proportional to 1,029.06, 1,419.75 and 780.12 is: 1,076.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.06 : 1,419.75 = 780.12 : x
  2. Step 2: Convert to fraction form
    1,029.06/1,419.75 = 780.12/x
  3. Step 3: Cross multiply
    1,029.06x = 1,419.75 × 780.12
  4. Step 4: Simplify right side
    1,029.06x = 1,107,575.37
  5. Step 5: Solve for x
    x = 1,107,575.37/1,029.06
  6. Step 6: Final answer
    x = 1,076.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.