Home / 1,445.12-2,167.80-405.13

Finding the Fourth Proportional to 1,445.12, 2,167.80 and 405.13

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Solution

The fourth proportional to 1,445.12, 2,167.80 and 405.13 is: 607.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.12 : 2,167.80 = 405.13 : x
  2. Step 2: Convert to fraction form
    1,445.12/2,167.80 = 405.13/x
  3. Step 3: Cross multiply
    1,445.12x = 2,167.80 × 405.13
  4. Step 4: Simplify right side
    1,445.12x = 878,240.81
  5. Step 5: Solve for x
    x = 878,240.81/1,445.12
  6. Step 6: Final answer
    x = 607.73

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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.