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Finding the Fourth Proportional to 982.10, 1,354.80 and 666.98

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Solution

The fourth proportional to 982.10, 1,354.80 and 666.98 is: 920.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.10 : 1,354.80 = 666.98 : x
  2. Step 2: Convert to fraction form
    982.10/1,354.80 = 666.98/x
  3. Step 3: Cross multiply
    982.10x = 1,354.80 × 666.98
  4. Step 4: Simplify right side
    982.10x = 903,624.50
  5. Step 5: Solve for x
    x = 903,624.50/982.10
  6. Step 6: Final answer
    x = 920.09

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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.