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Finding the Fourth Proportional to 1,287.05, 1,930.68 and 584.69

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Solution

The fourth proportional to 1,287.05, 1,930.68 and 584.69 is: 877.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.05 : 1,930.68 = 584.69 : x
  2. Step 2: Convert to fraction form
    1,287.05/1,930.68 = 584.69/x
  3. Step 3: Cross multiply
    1,287.05x = 1,930.68 × 584.69
  4. Step 4: Simplify right side
    1,287.05x = 1,128,849.29
  5. Step 5: Solve for x
    x = 1,128,849.29/1,287.05
  6. Step 6: Final answer
    x = 877.08

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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.