Home / 1,125.32-1,687.18-431.40

Finding the Fourth Proportional to 1,125.32, 1,687.18 and 431.40

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Solution

The fourth proportional to 1,125.32, 1,687.18 and 431.40 is: 646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.32 : 1,687.18 = 431.40 : x
  2. Step 2: Convert to fraction form
    1,125.32/1,687.18 = 431.40/x
  3. Step 3: Cross multiply
    1,125.32x = 1,687.18 × 431.40
  4. Step 4: Simplify right side
    1,125.32x = 727,848.37
  5. Step 5: Solve for x
    x = 727,848.37/1,125.32
  6. Step 6: Final answer
    x = 646.80

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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.