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Finding the Fourth Proportional to 803.88, 1,206.19 and 438.23

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Solution

The fourth proportional to 803.88, 1,206.19 and 438.23 is: 657.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.88 : 1,206.19 = 438.23 : x
  2. Step 2: Convert to fraction form
    803.88/1,206.19 = 438.23/x
  3. Step 3: Cross multiply
    803.88x = 1,206.19 × 438.23
  4. Step 4: Simplify right side
    803.88x = 528,588.64
  5. Step 5: Solve for x
    x = 528,588.64/803.88
  6. Step 6: Final answer
    x = 657.55

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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.