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Finding the Fourth Proportional to 1,274.45, 1,758.65 and 777.11

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Solution

The fourth proportional to 1,274.45, 1,758.65 and 777.11 is: 1,072.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.45 : 1,758.65 = 777.11 : x
  2. Step 2: Convert to fraction form
    1,274.45/1,758.65 = 777.11/x
  3. Step 3: Cross multiply
    1,274.45x = 1,758.65 × 777.11
  4. Step 4: Simplify right side
    1,274.45x = 1,366,651.82
  5. Step 5: Solve for x
    x = 1,366,651.82/1,274.45
  6. Step 6: Final answer
    x = 1,072.35

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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.