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Finding the Fourth Proportional to 291.00, 436.59 and 85.59

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Solution

The fourth proportional to 291.00, 436.59 and 85.59 is: 128.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.00 : 436.59 = 85.59 : x
  2. Step 2: Convert to fraction form
    291.00/436.59 = 85.59/x
  3. Step 3: Cross multiply
    291.00x = 436.59 × 85.59
  4. Step 4: Simplify right side
    291.00x = 37,367.74
  5. Step 5: Solve for x
    x = 37,367.74/291.00
  6. Step 6: Final answer
    x = 128.41

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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.