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Finding the Fourth Proportional to 788.18, 1,087.74 and 522.16

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Solution

The fourth proportional to 788.18, 1,087.74 and 522.16 is: 720.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.18 : 1,087.74 = 522.16 : x
  2. Step 2: Convert to fraction form
    788.18/1,087.74 = 522.16/x
  3. Step 3: Cross multiply
    788.18x = 1,087.74 × 522.16
  4. Step 4: Simplify right side
    788.18x = 567,966.27
  5. Step 5: Solve for x
    x = 567,966.27/788.18
  6. Step 6: Final answer
    x = 720.61

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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.