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Finding the Fourth Proportional to 1,435.21, 1,980.43 and 805.74

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Solution

The fourth proportional to 1,435.21, 1,980.43 and 805.74 is: 1,111.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.21 : 1,980.43 = 805.74 : x
  2. Step 2: Convert to fraction form
    1,435.21/1,980.43 = 805.74/x
  3. Step 3: Cross multiply
    1,435.21x = 1,980.43 × 805.74
  4. Step 4: Simplify right side
    1,435.21x = 1,595,711.67
  5. Step 5: Solve for x
    x = 1,595,711.67/1,435.21
  6. Step 6: Final answer
    x = 1,111.83

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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.