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Finding the Fourth Proportional to 882.23, 1,215.91 and 780.39

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Solution

The fourth proportional to 882.23, 1,215.91 and 780.39 is: 1,075.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.23 : 1,215.91 = 780.39 : x
  2. Step 2: Convert to fraction form
    882.23/1,215.91 = 780.39/x
  3. Step 3: Cross multiply
    882.23x = 1,215.91 × 780.39
  4. Step 4: Simplify right side
    882.23x = 948,882.05
  5. Step 5: Solve for x
    x = 948,882.05/882.23
  6. Step 6: Final answer
    x = 1,075.56

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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.