Home / 1,090.12-1,635.78-432.40

Finding the Fourth Proportional to 1,090.12, 1,635.78 and 432.40

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Solution

The fourth proportional to 1,090.12, 1,635.78 and 432.40 is: 648.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.12 : 1,635.78 = 432.40 : x
  2. Step 2: Convert to fraction form
    1,090.12/1,635.78 = 432.40/x
  3. Step 3: Cross multiply
    1,090.12x = 1,635.78 × 432.40
  4. Step 4: Simplify right side
    1,090.12x = 707,311.27
  5. Step 5: Solve for x
    x = 707,311.27/1,090.12
  6. Step 6: Final answer
    x = 648.84

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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.