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Finding the Fourth Proportional to 1,284.58, 1,774.74 and 842.32

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Solution

The fourth proportional to 1,284.58, 1,774.74 and 842.32 is: 1,163.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.58 : 1,774.74 = 842.32 : x
  2. Step 2: Convert to fraction form
    1,284.58/1,774.74 = 842.32/x
  3. Step 3: Cross multiply
    1,284.58x = 1,774.74 × 842.32
  4. Step 4: Simplify right side
    1,284.58x = 1,494,899.00
  5. Step 5: Solve for x
    x = 1,494,899.00/1,284.58
  6. Step 6: Final answer
    x = 1,163.73

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1.5x scale

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.