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Finding the Fourth Proportional to 1,208.43, 1,812.40 and 429

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Solution

The fourth proportional to 1,208.43, 1,812.40 and 429 is: 643.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.43 : 1,812.40 = 429 : x
  2. Step 2: Convert to fraction form
    1,208.43/1,812.40 = 429/x
  3. Step 3: Cross multiply
    1,208.43x = 1,812.40 × 429
  4. Step 4: Simplify right side
    1,208.43x = 777,519.60
  5. Step 5: Solve for x
    x = 777,519.60/1,208.43
  6. Step 6: Final answer
    x = 643.41

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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.