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Finding the Fourth Proportional to 1,265.98, 1,899.08 and 388.45

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Solution

The fourth proportional to 1,265.98, 1,899.08 and 388.45 is: 582.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.98 : 1,899.08 = 388.45 : x
  2. Step 2: Convert to fraction form
    1,265.98/1,899.08 = 388.45/x
  3. Step 3: Cross multiply
    1,265.98x = 1,899.08 × 388.45
  4. Step 4: Simplify right side
    1,265.98x = 737,697.63
  5. Step 5: Solve for x
    x = 737,697.63/1,265.98
  6. Step 6: Final answer
    x = 582.71

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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.