Home / 1,261.02-1,890.24-438.72

Finding the Fourth Proportional to 1,261.02, 1,890.24 and 438.72

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Solution

The fourth proportional to 1,261.02, 1,890.24 and 438.72 is: 657.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.02 : 1,890.24 = 438.72 : x
  2. Step 2: Convert to fraction form
    1,261.02/1,890.24 = 438.72/x
  3. Step 3: Cross multiply
    1,261.02x = 1,890.24 × 438.72
  4. Step 4: Simplify right side
    1,261.02x = 829,286.09
  5. Step 5: Solve for x
    x = 829,286.09/1,261.02
  6. Step 6: Final answer
    x = 657.63

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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.