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Finding the Fourth Proportional to 1,811.61, 2,717.01 and 513.05

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Solution

The fourth proportional to 1,811.61, 2,717.01 and 513.05 is: 769.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.61 : 2,717.01 = 513.05 : x
  2. Step 2: Convert to fraction form
    1,811.61/2,717.01 = 513.05/x
  3. Step 3: Cross multiply
    1,811.61x = 2,717.01 × 513.05
  4. Step 4: Simplify right side
    1,811.61x = 1,393,948.40
  5. Step 5: Solve for x
    x = 1,393,948.40/1,811.61
  6. Step 6: Final answer
    x = 769.45

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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.