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Finding the Fourth Proportional to 775.35, 1,161.86 and 611.01

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Solution

The fourth proportional to 775.35, 1,161.86 and 611.01 is: 915.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.35 : 1,161.86 = 611.01 : x
  2. Step 2: Convert to fraction form
    775.35/1,161.86 = 611.01/x
  3. Step 3: Cross multiply
    775.35x = 1,161.86 × 611.01
  4. Step 4: Simplify right side
    775.35x = 709,905.02
  5. Step 5: Solve for x
    x = 709,905.02/775.35
  6. Step 6: Final answer
    x = 915.59

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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.