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Finding the Fourth Proportional to 1,429.79, 2,145.15 and 608.75

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Solution

The fourth proportional to 1,429.79, 2,145.15 and 608.75 is: 913.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.79 : 2,145.15 = 608.75 : x
  2. Step 2: Convert to fraction form
    1,429.79/2,145.15 = 608.75/x
  3. Step 3: Cross multiply
    1,429.79x = 2,145.15 × 608.75
  4. Step 4: Simplify right side
    1,429.79x = 1,305,857.38
  5. Step 5: Solve for x
    x = 1,305,857.38/1,429.79
  6. Step 6: Final answer
    x = 913.32

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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.