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Finding the Fourth Proportional to 578.70, 811.80 and 578.70

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Solution

The fourth proportional to 578.70, 811.80 and 578.70 is: 811.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.70 : 811.80 = 578.70 : x
  2. Step 2: Convert to fraction form
    578.70/811.80 = 578.70/x
  3. Step 3: Cross multiply
    578.70x = 811.80 × 578.70
  4. Step 4: Simplify right side
    578.70x = 469,788.66
  5. Step 5: Solve for x
    x = 469,788.66/578.70
  6. Step 6: Final answer
    x = 811.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.