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Finding the Fourth Proportional to 785.20, 1,083.57 and 435.89

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Solution

The fourth proportional to 785.20, 1,083.57 and 435.89 is: 601.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.20 : 1,083.57 = 435.89 : x
  2. Step 2: Convert to fraction form
    785.20/1,083.57 = 435.89/x
  3. Step 3: Cross multiply
    785.20x = 1,083.57 × 435.89
  4. Step 4: Simplify right side
    785.20x = 472,317.33
  5. Step 5: Solve for x
    x = 472,317.33/785.20
  6. Step 6: Final answer
    x = 601.52

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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.