Home / 1,420.74-2,122.88-1,111.86

Finding the Fourth Proportional to 1,420.74, 2,122.88 and 1,111.86

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Solution

The fourth proportional to 1,420.74, 2,122.88 and 1,111.86 is: 1,661.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.74 : 2,122.88 = 1,111.86 : x
  2. Step 2: Convert to fraction form
    1,420.74/2,122.88 = 1,111.86/x
  3. Step 3: Cross multiply
    1,420.74x = 2,122.88 × 1,111.86
  4. Step 4: Simplify right side
    1,420.74x = 2,360,339.80
  5. Step 5: Solve for x
    x = 2,360,339.80/1,420.74
  6. Step 6: Final answer
    x = 1,661.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.