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Finding the Fourth Proportional to 1,811.71, 2,715.76 and 578.22

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Solution

The fourth proportional to 1,811.71, 2,715.76 and 578.22 is: 866.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.71 : 2,715.76 = 578.22 : x
  2. Step 2: Convert to fraction form
    1,811.71/2,715.76 = 578.22/x
  3. Step 3: Cross multiply
    1,811.71x = 2,715.76 × 578.22
  4. Step 4: Simplify right side
    1,811.71x = 1,570,306.75
  5. Step 5: Solve for x
    x = 1,570,306.75/1,811.71
  6. Step 6: Final answer
    x = 866.75

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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.