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Finding the Fourth Proportional to 1,116.65, 1,674.77 and 386.23

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Solution

The fourth proportional to 1,116.65, 1,674.77 and 386.23 is: 579.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.65 : 1,674.77 = 386.23 : x
  2. Step 2: Convert to fraction form
    1,116.65/1,674.77 = 386.23/x
  3. Step 3: Cross multiply
    1,116.65x = 1,674.77 × 386.23
  4. Step 4: Simplify right side
    1,116.65x = 646,844.49
  5. Step 5: Solve for x
    x = 646,844.49/1,116.65
  6. Step 6: Final answer
    x = 579.27

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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.