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Finding the Fourth Proportional to 905.58, 1,357.22 and 515.77

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Solution

The fourth proportional to 905.58, 1,357.22 and 515.77 is: 773.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.58 : 1,357.22 = 515.77 : x
  2. Step 2: Convert to fraction form
    905.58/1,357.22 = 515.77/x
  3. Step 3: Cross multiply
    905.58x = 1,357.22 × 515.77
  4. Step 4: Simplify right side
    905.58x = 700,011.26
  5. Step 5: Solve for x
    x = 700,011.26/905.58
  6. Step 6: Final answer
    x = 773.00

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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.