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Finding the Fourth Proportional to 873, 1,204.90 and 505

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Solution

The fourth proportional to 873, 1,204.90 and 505 is: 696.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    873 : 1,204.90 = 505 : x
  2. Step 2: Convert to fraction form
    873/1,204.90 = 505/x
  3. Step 3: Cross multiply
    873x = 1,204.90 × 505
  4. Step 4: Simplify right side
    873x = 608,474.50
  5. Step 5: Solve for x
    x = 608,474.50/873
  6. Step 6: Final answer
    x = 696.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.