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Finding the Fourth Proportional to 1,021.90, 1,533.39 and 611.85

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Solution

The fourth proportional to 1,021.90, 1,533.39 and 611.85 is: 918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.90 : 1,533.39 = 611.85 : x
  2. Step 2: Convert to fraction form
    1,021.90/1,533.39 = 611.85/x
  3. Step 3: Cross multiply
    1,021.90x = 1,533.39 × 611.85
  4. Step 4: Simplify right side
    1,021.90x = 938,204.67
  5. Step 5: Solve for x
    x = 938,204.67/1,021.90
  6. Step 6: Final answer
    x = 918.10

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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.