Home / 1,090.20-1,634.09-431.47

Finding the Fourth Proportional to 1,090.20, 1,634.09 and 431.47

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Solution

The fourth proportional to 1,090.20, 1,634.09 and 431.47 is: 646.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.20 : 1,634.09 = 431.47 : x
  2. Step 2: Convert to fraction form
    1,090.20/1,634.09 = 431.47/x
  3. Step 3: Cross multiply
    1,090.20x = 1,634.09 × 431.47
  4. Step 4: Simplify right side
    1,090.20x = 705,058.65
  5. Step 5: Solve for x
    x = 705,058.65/1,090.20
  6. Step 6: Final answer
    x = 646.72

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1.5x scale

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.