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Finding the Fourth Proportional to 1,200, 1,656.54 and 890.04

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Solution

The fourth proportional to 1,200, 1,656.54 and 890.04 is: 1,228.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200 : 1,656.54 = 890.04 : x
  2. Step 2: Convert to fraction form
    1,200/1,656.54 = 890.04/x
  3. Step 3: Cross multiply
    1,200x = 1,656.54 × 890.04
  4. Step 4: Simplify right side
    1,200x = 1,474,386.86
  5. Step 5: Solve for x
    x = 1,474,386.86/1,200
  6. Step 6: Final answer
    x = 1,228.66

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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.