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Finding the Fourth Proportional to 1,429.77, 2,145 and 455.88

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Solution

The fourth proportional to 1,429.77, 2,145 and 455.88 is: 683.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.77 : 2,145 = 455.88 : x
  2. Step 2: Convert to fraction form
    1,429.77/2,145 = 455.88/x
  3. Step 3: Cross multiply
    1,429.77x = 2,145 × 455.88
  4. Step 4: Simplify right side
    1,429.77x = 977,862.60
  5. Step 5: Solve for x
    x = 977,862.60/1,429.77
  6. Step 6: Final answer
    x = 683.93

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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.