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Finding the Fourth Proportional to 809.95, 1,215.08 and 289.99

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Solution

The fourth proportional to 809.95, 1,215.08 and 289.99 is: 435.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.95 : 1,215.08 = 289.99 : x
  2. Step 2: Convert to fraction form
    809.95/1,215.08 = 289.99/x
  3. Step 3: Cross multiply
    809.95x = 1,215.08 × 289.99
  4. Step 4: Simplify right side
    809.95x = 352,361.05
  5. Step 5: Solve for x
    x = 352,361.05/809.95
  6. Step 6: Final answer
    x = 435.04

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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.