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Finding the Fourth Proportional to 887.94, 1,331.40 and 339.78

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Solution

The fourth proportional to 887.94, 1,331.40 and 339.78 is: 509.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.94 : 1,331.40 = 339.78 : x
  2. Step 2: Convert to fraction form
    887.94/1,331.40 = 339.78/x
  3. Step 3: Cross multiply
    887.94x = 1,331.40 × 339.78
  4. Step 4: Simplify right side
    887.94x = 452,383.09
  5. Step 5: Solve for x
    x = 452,383.09/887.94
  6. Step 6: Final answer
    x = 509.47

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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.