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Finding the Fourth Proportional to 927.66, 1,279.08 and 780.06

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Solution

The fourth proportional to 927.66, 1,279.08 and 780.06 is: 1,075.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.66 : 1,279.08 = 780.06 : x
  2. Step 2: Convert to fraction form
    927.66/1,279.08 = 780.06/x
  3. Step 3: Cross multiply
    927.66x = 1,279.08 × 780.06
  4. Step 4: Simplify right side
    927.66x = 997,759.14
  5. Step 5: Solve for x
    x = 997,759.14/927.66
  6. Step 6: Final answer
    x = 1,075.57

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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.