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Finding the Fourth Proportional to 785.12, 1,083.66 and 490.72

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Solution

The fourth proportional to 785.12, 1,083.66 and 490.72 is: 677.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.12 : 1,083.66 = 490.72 : x
  2. Step 2: Convert to fraction form
    785.12/1,083.66 = 490.72/x
  3. Step 3: Cross multiply
    785.12x = 1,083.66 × 490.72
  4. Step 4: Simplify right side
    785.12x = 531,773.64
  5. Step 5: Solve for x
    x = 531,773.64/785.12
  6. Step 6: Final answer
    x = 677.32

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Double scale
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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.