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Finding the Fourth Proportional to 504.70, 696.40 and 305.50

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Solution

The fourth proportional to 504.70, 696.40 and 305.50 is: 421.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.70 : 696.40 = 305.50 : x
  2. Step 2: Convert to fraction form
    504.70/696.40 = 305.50/x
  3. Step 3: Cross multiply
    504.70x = 696.40 × 305.50
  4. Step 4: Simplify right side
    504.70x = 212,750.20
  5. Step 5: Solve for x
    x = 212,750.20/504.70
  6. Step 6: Final answer
    x = 421.54

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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.