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Finding the Fourth Proportional to 1,776.90, 2,667.36 and 1,128

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Solution

The fourth proportional to 1,776.90, 2,667.36 and 1,128 is: 1,693.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,776.90 : 2,667.36 = 1,128 : x
  2. Step 2: Convert to fraction form
    1,776.90/2,667.36 = 1,128/x
  3. Step 3: Cross multiply
    1,776.90x = 2,667.36 × 1,128
  4. Step 4: Simplify right side
    1,776.90x = 3,008,782.08
  5. Step 5: Solve for x
    x = 3,008,782.08/1,776.90
  6. Step 6: Final answer
    x = 1,693.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.