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Finding the Fourth Proportional to 379.86, 570.40 and 287.32

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Solution

The fourth proportional to 379.86, 570.40 and 287.32 is: 431.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.86 : 570.40 = 287.32 : x
  2. Step 2: Convert to fraction form
    379.86/570.40 = 287.32/x
  3. Step 3: Cross multiply
    379.86x = 570.40 × 287.32
  4. Step 4: Simplify right side
    379.86x = 163,885.18
  5. Step 5: Solve for x
    x = 163,885.18/379.86
  6. Step 6: Final answer
    x = 431.44

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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.