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Finding the Fourth Proportional to 429.71, 645.34 and 412.31

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Solution

The fourth proportional to 429.71, 645.34 and 412.31 is: 619.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.71 : 645.34 = 412.31 : x
  2. Step 2: Convert to fraction form
    429.71/645.34 = 412.31/x
  3. Step 3: Cross multiply
    429.71x = 645.34 × 412.31
  4. Step 4: Simplify right side
    429.71x = 266,075.88
  5. Step 5: Solve for x
    x = 266,075.88/429.71
  6. Step 6: Final answer
    x = 619.21

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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.