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Finding the Fourth Proportional to 1,011.49, 1,395.93 and 775.78

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Solution

The fourth proportional to 1,011.49, 1,395.93 and 775.78 is: 1,070.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.49 : 1,395.93 = 775.78 : x
  2. Step 2: Convert to fraction form
    1,011.49/1,395.93 = 775.78/x
  3. Step 3: Cross multiply
    1,011.49x = 1,395.93 × 775.78
  4. Step 4: Simplify right side
    1,011.49x = 1,082,933.99
  5. Step 5: Solve for x
    x = 1,082,933.99/1,011.49
  6. Step 6: Final answer
    x = 1,070.64

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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.