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Finding the Fourth Proportional to 1,021, 1,531.50 and 405.04

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Solution

The fourth proportional to 1,021, 1,531.50 and 405.04 is: 607.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021 : 1,531.50 = 405.04 : x
  2. Step 2: Convert to fraction form
    1,021/1,531.50 = 405.04/x
  3. Step 3: Cross multiply
    1,021x = 1,531.50 × 405.04
  4. Step 4: Simplify right side
    1,021x = 620,318.76
  5. Step 5: Solve for x
    x = 620,318.76/1,021
  6. Step 6: Final answer
    x = 607.56

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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.