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Finding the Fourth Proportional to 788.03, 1,087.40 and 438.70

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Solution

The fourth proportional to 788.03, 1,087.40 and 438.70 is: 605.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.03 : 1,087.40 = 438.70 : x
  2. Step 2: Convert to fraction form
    788.03/1,087.40 = 438.70/x
  3. Step 3: Cross multiply
    788.03x = 1,087.40 × 438.70
  4. Step 4: Simplify right side
    788.03x = 477,034.75
  5. Step 5: Solve for x
    x = 477,034.75/788.03
  6. Step 6: Final answer
    x = 605.35

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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.