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Finding the Fourth Proportional to 1,021.53, 1,409.15 and 667.01

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Solution

The fourth proportional to 1,021.53, 1,409.15 and 667.01 is: 920.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.53 : 1,409.15 = 667.01 : x
  2. Step 2: Convert to fraction form
    1,021.53/1,409.15 = 667.01/x
  3. Step 3: Cross multiply
    1,021.53x = 1,409.15 × 667.01
  4. Step 4: Simplify right side
    1,021.53x = 939,917.14
  5. Step 5: Solve for x
    x = 939,917.14/1,021.53
  6. Step 6: Final answer
    x = 920.11

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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.