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Finding the Fourth Proportional to 1,288.94, 1,776.02 and 874.22

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Solution

The fourth proportional to 1,288.94, 1,776.02 and 874.22 is: 1,204.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.94 : 1,776.02 = 874.22 : x
  2. Step 2: Convert to fraction form
    1,288.94/1,776.02 = 874.22/x
  3. Step 3: Cross multiply
    1,288.94x = 1,776.02 × 874.22
  4. Step 4: Simplify right side
    1,288.94x = 1,552,632.20
  5. Step 5: Solve for x
    x = 1,552,632.20/1,288.94
  6. Step 6: Final answer
    x = 1,204.58

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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.