Home / 1,211.00-1,671.98-1,079.78

Finding the Fourth Proportional to 1,211.00, 1,671.98 and 1,079.78

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Solution

The fourth proportional to 1,211.00, 1,671.98 and 1,079.78 is: 1,490.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.00 : 1,671.98 = 1,079.78 : x
  2. Step 2: Convert to fraction form
    1,211.00/1,671.98 = 1,079.78/x
  3. Step 3: Cross multiply
    1,211.00x = 1,671.98 × 1,079.78
  4. Step 4: Simplify right side
    1,211.00x = 1,805,356.81
  5. Step 5: Solve for x
    x = 1,805,356.81/1,211.00
  6. Step 6: Final answer
    x = 1,490.80

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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.