Home / 1,405.28-2,108.12-431.68

Finding the Fourth Proportional to 1,405.28, 2,108.12 and 431.68

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Solution

The fourth proportional to 1,405.28, 2,108.12 and 431.68 is: 647.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.28 : 2,108.12 = 431.68 : x
  2. Step 2: Convert to fraction form
    1,405.28/2,108.12 = 431.68/x
  3. Step 3: Cross multiply
    1,405.28x = 2,108.12 × 431.68
  4. Step 4: Simplify right side
    1,405.28x = 910,033.24
  5. Step 5: Solve for x
    x = 910,033.24/1,405.28
  6. Step 6: Final answer
    x = 647.58

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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.