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Finding the Fourth Proportional to 1,431.88, 2,148.04 and 458.26

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Solution

The fourth proportional to 1,431.88, 2,148.04 and 458.26 is: 687.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.88 : 2,148.04 = 458.26 : x
  2. Step 2: Convert to fraction form
    1,431.88/2,148.04 = 458.26/x
  3. Step 3: Cross multiply
    1,431.88x = 2,148.04 × 458.26
  4. Step 4: Simplify right side
    1,431.88x = 984,360.81
  5. Step 5: Solve for x
    x = 984,360.81/1,431.88
  6. Step 6: Final answer
    x = 687.46

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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.