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Finding the Fourth Proportional to 1,299.69, 1,792.80 and 945.20

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Solution

The fourth proportional to 1,299.69, 1,792.80 and 945.20 is: 1,303.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.69 : 1,792.80 = 945.20 : x
  2. Step 2: Convert to fraction form
    1,299.69/1,792.80 = 945.20/x
  3. Step 3: Cross multiply
    1,299.69x = 1,792.80 × 945.20
  4. Step 4: Simplify right side
    1,299.69x = 1,694,559.04
  5. Step 5: Solve for x
    x = 1,694,559.04/1,299.69
  6. Step 6: Final answer
    x = 1,303.82

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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.