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Finding the Fourth Proportional to 1,279.77, 1,916.07 and 662.14

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Solution

The fourth proportional to 1,279.77, 1,916.07 and 662.14 is: 991.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.77 : 1,916.07 = 662.14 : x
  2. Step 2: Convert to fraction form
    1,279.77/1,916.07 = 662.14/x
  3. Step 3: Cross multiply
    1,279.77x = 1,916.07 × 662.14
  4. Step 4: Simplify right side
    1,279.77x = 1,268,706.59
  5. Step 5: Solve for x
    x = 1,268,706.59/1,279.77
  6. Step 6: Final answer
    x = 991.36

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1.5x scale

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.