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Finding the Fourth Proportional to 873.45, 1,206.09 and 780.03

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Solution

The fourth proportional to 873.45, 1,206.09 and 780.03 is: 1,077.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.45 : 1,206.09 = 780.03 : x
  2. Step 2: Convert to fraction form
    873.45/1,206.09 = 780.03/x
  3. Step 3: Cross multiply
    873.45x = 1,206.09 × 780.03
  4. Step 4: Simplify right side
    873.45x = 940,786.38
  5. Step 5: Solve for x
    x = 940,786.38/873.45
  6. Step 6: Final answer
    x = 1,077.09

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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.