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Finding the Fourth Proportional to 291.44, 436.61 and 145.01

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Solution

The fourth proportional to 291.44, 436.61 and 145.01 is: 217.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.44 : 436.61 = 145.01 : x
  2. Step 2: Convert to fraction form
    291.44/436.61 = 145.01/x
  3. Step 3: Cross multiply
    291.44x = 436.61 × 145.01
  4. Step 4: Simplify right side
    291.44x = 63,312.82
  5. Step 5: Solve for x
    x = 63,312.82/291.44
  6. Step 6: Final answer
    x = 217.25

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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.