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Finding the Fourth Proportional to 387.15, 579.69 and 249.45

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Solution

The fourth proportional to 387.15, 579.69 and 249.45 is: 373.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.15 : 579.69 = 249.45 : x
  2. Step 2: Convert to fraction form
    387.15/579.69 = 249.45/x
  3. Step 3: Cross multiply
    387.15x = 579.69 × 249.45
  4. Step 4: Simplify right side
    387.15x = 144,603.67
  5. Step 5: Solve for x
    x = 144,603.67/387.15
  6. Step 6: Final answer
    x = 373.51

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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.