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Finding the Fourth Proportional to 412.90, 619.45 and 230.31

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Solution

The fourth proportional to 412.90, 619.45 and 230.31 is: 345.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.90 : 619.45 = 230.31 : x
  2. Step 2: Convert to fraction form
    412.90/619.45 = 230.31/x
  3. Step 3: Cross multiply
    412.90x = 619.45 × 230.31
  4. Step 4: Simplify right side
    412.90x = 142,664.95
  5. Step 5: Solve for x
    x = 142,664.95/412.90
  6. Step 6: Final answer
    x = 345.52

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1.5x scale

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.