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Finding the Fourth Proportional to 387.09, 577.19 and 382.31

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Solution

The fourth proportional to 387.09, 577.19 and 382.31 is: 570.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.09 : 577.19 = 382.31 : x
  2. Step 2: Convert to fraction form
    387.09/577.19 = 382.31/x
  3. Step 3: Cross multiply
    387.09x = 577.19 × 382.31
  4. Step 4: Simplify right side
    387.09x = 220,660.71
  5. Step 5: Solve for x
    x = 220,660.71/387.09
  6. Step 6: Final answer
    x = 570.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.