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Finding the Fourth Proportional to 680.94, 1,020.15 and 388.08

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Solution

The fourth proportional to 680.94, 1,020.15 and 388.08 is: 581.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.94 : 1,020.15 = 388.08 : x
  2. Step 2: Convert to fraction form
    680.94/1,020.15 = 388.08/x
  3. Step 3: Cross multiply
    680.94x = 1,020.15 × 388.08
  4. Step 4: Simplify right side
    680.94x = 395,899.81
  5. Step 5: Solve for x
    x = 395,899.81/680.94
  6. Step 6: Final answer
    x = 581.40

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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.