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Finding the Fourth Proportional to 1,294.88, 1,942.59 and 429.20

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Solution

The fourth proportional to 1,294.88, 1,942.59 and 429.20 is: 643.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.88 : 1,942.59 = 429.20 : x
  2. Step 2: Convert to fraction form
    1,294.88/1,942.59 = 429.20/x
  3. Step 3: Cross multiply
    1,294.88x = 1,942.59 × 429.20
  4. Step 4: Simplify right side
    1,294.88x = 833,759.63
  5. Step 5: Solve for x
    x = 833,759.63/1,294.88
  6. Step 6: Final answer
    x = 643.89

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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.