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Finding the Fourth Proportional to 1,029.77, 1,421.75 and 919.06

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Solution

The fourth proportional to 1,029.77, 1,421.75 and 919.06 is: 1,268.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.77 : 1,421.75 = 919.06 : x
  2. Step 2: Convert to fraction form
    1,029.77/1,421.75 = 919.06/x
  3. Step 3: Cross multiply
    1,029.77x = 1,421.75 × 919.06
  4. Step 4: Simplify right side
    1,029.77x = 1,306,661.85
  5. Step 5: Solve for x
    x = 1,306,661.85/1,029.77
  6. Step 6: Final answer
    x = 1,268.89

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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.