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Finding the Fourth Proportional to 449.46, 618.75 and 388.13

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Solution

The fourth proportional to 449.46, 618.75 and 388.13 is: 534.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.46 : 618.75 = 388.13 : x
  2. Step 2: Convert to fraction form
    449.46/618.75 = 388.13/x
  3. Step 3: Cross multiply
    449.46x = 618.75 × 388.13
  4. Step 4: Simplify right side
    449.46x = 240,152.34
  5. Step 5: Solve for x
    x = 240,152.34/449.46
  6. Step 6: Final answer
    x = 534.31

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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.