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Finding the Fourth Proportional to 1,290.14, 1,780.62 and 730.64

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Solution

The fourth proportional to 1,290.14, 1,780.62 and 730.64 is: 1,008.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.14 : 1,780.62 = 730.64 : x
  2. Step 2: Convert to fraction form
    1,290.14/1,780.62 = 730.64/x
  3. Step 3: Cross multiply
    1,290.14x = 1,780.62 × 730.64
  4. Step 4: Simplify right side
    1,290.14x = 1,300,992.20
  5. Step 5: Solve for x
    x = 1,300,992.20/1,290.14
  6. Step 6: Final answer
    x = 1,008.41

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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.