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Finding the Fourth Proportional to 788.09, 1,087.52 and 438.75

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Solution

The fourth proportional to 788.09, 1,087.52 and 438.75 is: 605.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.09 : 1,087.52 = 438.75 : x
  2. Step 2: Convert to fraction form
    788.09/1,087.52 = 438.75/x
  3. Step 3: Cross multiply
    788.09x = 1,087.52 × 438.75
  4. Step 4: Simplify right side
    788.09x = 477,147.21
  5. Step 5: Solve for x
    x = 477,147.21/788.09
  6. Step 6: Final answer
    x = 605.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.