Home / 1,445.30-2,167.90-405.30

Finding the Fourth Proportional to 1,445.30, 2,167.90 and 405.30

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Solution

The fourth proportional to 1,445.30, 2,167.90 and 405.30 is: 607.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.30 : 2,167.90 = 405.30 : x
  2. Step 2: Convert to fraction form
    1,445.30/2,167.90 = 405.30/x
  3. Step 3: Cross multiply
    1,445.30x = 2,167.90 × 405.30
  4. Step 4: Simplify right side
    1,445.30x = 878,649.87
  5. Step 5: Solve for x
    x = 878,649.87/1,445.30
  6. Step 6: Final answer
    x = 607.94

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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.