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Finding the Fourth Proportional to 722.55, 1,089.60 and 712.80

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Solution

The fourth proportional to 722.55, 1,089.60 and 712.80 is: 1,074.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.55 : 1,089.60 = 712.80 : x
  2. Step 2: Convert to fraction form
    722.55/1,089.60 = 712.80/x
  3. Step 3: Cross multiply
    722.55x = 1,089.60 × 712.80
  4. Step 4: Simplify right side
    722.55x = 776,666.88
  5. Step 5: Solve for x
    x = 776,666.88/722.55
  6. Step 6: Final answer
    x = 1,074.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.