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Finding the Fourth Proportional to 1,116.55, 1,674.69 and 386.20

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Solution

The fourth proportional to 1,116.55, 1,674.69 and 386.20 is: 579.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.55 : 1,674.69 = 386.20 : x
  2. Step 2: Convert to fraction form
    1,116.55/1,674.69 = 386.20/x
  3. Step 3: Cross multiply
    1,116.55x = 1,674.69 × 386.20
  4. Step 4: Simplify right side
    1,116.55x = 646,765.28
  5. Step 5: Solve for x
    x = 646,765.28/1,116.55
  6. Step 6: Final answer
    x = 579.25

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1.5x scale

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.