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Finding the Fourth Proportional to 991.78, 1,486.98 and 504.50

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Solution

The fourth proportional to 991.78, 1,486.98 and 504.50 is: 756.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.78 : 1,486.98 = 504.50 : x
  2. Step 2: Convert to fraction form
    991.78/1,486.98 = 504.50/x
  3. Step 3: Cross multiply
    991.78x = 1,486.98 × 504.50
  4. Step 4: Simplify right side
    991.78x = 750,173.98
  5. Step 5: Solve for x
    x = 750,173.98/991.78
  6. Step 6: Final answer
    x = 756.39

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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.