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Finding the Fourth Proportional to 1,385.36, 1,911.78 and 764.36

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Solution

The fourth proportional to 1,385.36, 1,911.78 and 764.36 is: 1,054.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.36 : 1,911.78 = 764.36 : x
  2. Step 2: Convert to fraction form
    1,385.36/1,911.78 = 764.36/x
  3. Step 3: Cross multiply
    1,385.36x = 1,911.78 × 764.36
  4. Step 4: Simplify right side
    1,385.36x = 1,461,288.16
  5. Step 5: Solve for x
    x = 1,461,288.16/1,385.36
  6. Step 6: Final answer
    x = 1,054.81

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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.