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Finding the Fourth Proportional to 387.32, 578.64 and 249.24

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Solution

The fourth proportional to 387.32, 578.64 and 249.24 is: 372.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.32 : 578.64 = 249.24 : x
  2. Step 2: Convert to fraction form
    387.32/578.64 = 249.24/x
  3. Step 3: Cross multiply
    387.32x = 578.64 × 249.24
  4. Step 4: Simplify right side
    387.32x = 144,220.23
  5. Step 5: Solve for x
    x = 144,220.23/387.32
  6. Step 6: Final answer
    x = 372.35

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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.