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Finding the Fourth Proportional to 1,287.61, 1,930.87 and 594.07

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Solution

The fourth proportional to 1,287.61, 1,930.87 and 594.07 is: 890.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.61 : 1,930.87 = 594.07 : x
  2. Step 2: Convert to fraction form
    1,287.61/1,930.87 = 594.07/x
  3. Step 3: Cross multiply
    1,287.61x = 1,930.87 × 594.07
  4. Step 4: Simplify right side
    1,287.61x = 1,147,071.94
  5. Step 5: Solve for x
    x = 1,147,071.94/1,287.61
  6. Step 6: Final answer
    x = 890.85

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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.