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Finding the Fourth Proportional to 1,330.50, 1,996.56 and 561

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Solution

The fourth proportional to 1,330.50, 1,996.56 and 561 is: 841.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.50 : 1,996.56 = 561 : x
  2. Step 2: Convert to fraction form
    1,330.50/1,996.56 = 561/x
  3. Step 3: Cross multiply
    1,330.50x = 1,996.56 × 561
  4. Step 4: Simplify right side
    1,330.50x = 1,120,070.16
  5. Step 5: Solve for x
    x = 1,120,070.16/1,330.50
  6. Step 6: Final answer
    x = 841.84

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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.