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Finding the Fourth Proportional to 696.68, 1,043.20 and 388.16

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Solution

The fourth proportional to 696.68, 1,043.20 and 388.16 is: 581.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.68 : 1,043.20 = 388.16 : x
  2. Step 2: Convert to fraction form
    696.68/1,043.20 = 388.16/x
  3. Step 3: Cross multiply
    696.68x = 1,043.20 × 388.16
  4. Step 4: Simplify right side
    696.68x = 404,928.51
  5. Step 5: Solve for x
    x = 404,928.51/696.68
  6. Step 6: Final answer
    x = 581.23

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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.