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Finding the Fourth Proportional to 1,811.55, 2,717.70 and 578.80

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Solution

The fourth proportional to 1,811.55, 2,717.70 and 578.80 is: 868.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.55 : 2,717.70 = 578.80 : x
  2. Step 2: Convert to fraction form
    1,811.55/2,717.70 = 578.80/x
  3. Step 3: Cross multiply
    1,811.55x = 2,717.70 × 578.80
  4. Step 4: Simplify right side
    1,811.55x = 1,573,004.76
  5. Step 5: Solve for x
    x = 1,573,004.76/1,811.55
  6. Step 6: Final answer
    x = 868.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.