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Finding the Fourth Proportional to 1,175.45, 1,620.79 and 802.65

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Solution

The fourth proportional to 1,175.45, 1,620.79 and 802.65 is: 1,106.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.45 : 1,620.79 = 802.65 : x
  2. Step 2: Convert to fraction form
    1,175.45/1,620.79 = 802.65/x
  3. Step 3: Cross multiply
    1,175.45x = 1,620.79 × 802.65
  4. Step 4: Simplify right side
    1,175.45x = 1,300,927.09
  5. Step 5: Solve for x
    x = 1,300,927.09/1,175.45
  6. Step 6: Final answer
    x = 1,106.75

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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.