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Finding the Fourth Proportional to 449.20, 619.36 and 386.93

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Solution

The fourth proportional to 449.20, 619.36 and 386.93 is: 533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.20 : 619.36 = 386.93 : x
  2. Step 2: Convert to fraction form
    449.20/619.36 = 386.93/x
  3. Step 3: Cross multiply
    449.20x = 619.36 × 386.93
  4. Step 4: Simplify right side
    449.20x = 239,646.84
  5. Step 5: Solve for x
    x = 239,646.84/449.20
  6. Step 6: Final answer
    x = 533.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.