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Finding the Fourth Proportional to 1,020.60, 1,531.02 and 404.25

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Solution

The fourth proportional to 1,020.60, 1,531.02 and 404.25 is: 606.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.60 : 1,531.02 = 404.25 : x
  2. Step 2: Convert to fraction form
    1,020.60/1,531.02 = 404.25/x
  3. Step 3: Cross multiply
    1,020.60x = 1,531.02 × 404.25
  4. Step 4: Simplify right side
    1,020.60x = 618,914.84
  5. Step 5: Solve for x
    x = 618,914.84/1,020.60
  6. Step 6: Final answer
    x = 606.42

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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.