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Finding the Fourth Proportional to 553.50, 830.61 and 211.50

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Solution

The fourth proportional to 553.50, 830.61 and 211.50 is: 317.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.50 : 830.61 = 211.50 : x
  2. Step 2: Convert to fraction form
    553.50/830.61 = 211.50/x
  3. Step 3: Cross multiply
    553.50x = 830.61 × 211.50
  4. Step 4: Simplify right side
    553.50x = 175,674.02
  5. Step 5: Solve for x
    x = 175,674.02/553.50
  6. Step 6: Final answer
    x = 317.39

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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.