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Finding the Fourth Proportional to 899.36, 1,348.32 and 386

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Solution

The fourth proportional to 899.36, 1,348.32 and 386 is: 578.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.36 : 1,348.32 = 386 : x
  2. Step 2: Convert to fraction form
    899.36/1,348.32 = 386/x
  3. Step 3: Cross multiply
    899.36x = 1,348.32 × 386
  4. Step 4: Simplify right side
    899.36x = 520,451.52
  5. Step 5: Solve for x
    x = 520,451.52/899.36
  6. Step 6: Final answer
    x = 578.69

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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.