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Finding the Fourth Proportional to 788.40, 1,087.56 and 589.44

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Solution

The fourth proportional to 788.40, 1,087.56 and 589.44 is: 813.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.40 : 1,087.56 = 589.44 : x
  2. Step 2: Convert to fraction form
    788.40/1,087.56 = 589.44/x
  3. Step 3: Cross multiply
    788.40x = 1,087.56 × 589.44
  4. Step 4: Simplify right side
    788.40x = 641,051.37
  5. Step 5: Solve for x
    x = 641,051.37/788.40
  6. Step 6: Final answer
    x = 813.10

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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.