Home / 1,188.21-1,635.70-1,021.45

Finding the Fourth Proportional to 1,188.21, 1,635.70 and 1,021.45

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Solution

The fourth proportional to 1,188.21, 1,635.70 and 1,021.45 is: 1,406.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.21 : 1,635.70 = 1,021.45 : x
  2. Step 2: Convert to fraction form
    1,188.21/1,635.70 = 1,021.45/x
  3. Step 3: Cross multiply
    1,188.21x = 1,635.70 × 1,021.45
  4. Step 4: Simplify right side
    1,188.21x = 1,670,785.77
  5. Step 5: Solve for x
    x = 1,670,785.77/1,188.21
  6. Step 6: Final answer
    x = 1,406.14

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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.