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Finding the Fourth Proportional to 788.54, 1,089.25 and 729

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Solution

The fourth proportional to 788.54, 1,089.25 and 729 is: 1,007.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.54 : 1,089.25 = 729 : x
  2. Step 2: Convert to fraction form
    788.54/1,089.25 = 729/x
  3. Step 3: Cross multiply
    788.54x = 1,089.25 × 729
  4. Step 4: Simplify right side
    788.54x = 794,061.43
  5. Step 5: Solve for x
    x = 794,061.43/788.54
  6. Step 6: Final answer
    x = 1,007.01

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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.