Home / 1,021.57-1,531.98-405.07

Finding the Fourth Proportional to 1,021.57, 1,531.98 and 405.07

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Solution

The fourth proportional to 1,021.57, 1,531.98 and 405.07 is: 607.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.57 : 1,531.98 = 405.07 : x
  2. Step 2: Convert to fraction form
    1,021.57/1,531.98 = 405.07/x
  3. Step 3: Cross multiply
    1,021.57x = 1,531.98 × 405.07
  4. Step 4: Simplify right side
    1,021.57x = 620,557.11
  5. Step 5: Solve for x
    x = 620,557.11/1,021.57
  6. Step 6: Final answer
    x = 607.45

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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.