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Finding the Fourth Proportional to 1,021.01, 1,535.83 and 921.65

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Solution

The fourth proportional to 1,021.01, 1,535.83 and 921.65 is: 1,386.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.01 : 1,535.83 = 921.65 : x
  2. Step 2: Convert to fraction form
    1,021.01/1,535.83 = 921.65/x
  3. Step 3: Cross multiply
    1,021.01x = 1,535.83 × 921.65
  4. Step 4: Simplify right side
    1,021.01x = 1,415,490.04
  5. Step 5: Solve for x
    x = 1,415,490.04/1,021.01
  6. Step 6: Final answer
    x = 1,386.37

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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.