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Finding the Fourth Proportional to 1,208.40, 1,812.12 and 477.90

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Solution

The fourth proportional to 1,208.40, 1,812.12 and 477.90 is: 716.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.40 : 1,812.12 = 477.90 : x
  2. Step 2: Convert to fraction form
    1,208.40/1,812.12 = 477.90/x
  3. Step 3: Cross multiply
    1,208.40x = 1,812.12 × 477.90
  4. Step 4: Simplify right side
    1,208.40x = 866,012.15
  5. Step 5: Solve for x
    x = 866,012.15/1,208.40
  6. Step 6: Final answer
    x = 716.66

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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.