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Finding the Fourth Proportional to 788.05, 1,089.01 and 591.22

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Solution

The fourth proportional to 788.05, 1,089.01 and 591.22 is: 817.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.05 : 1,089.01 = 591.22 : x
  2. Step 2: Convert to fraction form
    788.05/1,089.01 = 591.22/x
  3. Step 3: Cross multiply
    788.05x = 1,089.01 × 591.22
  4. Step 4: Simplify right side
    788.05x = 643,844.49
  5. Step 5: Solve for x
    x = 643,844.49/788.05
  6. Step 6: Final answer
    x = 817.01

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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.