Home / 1,261.16-1,890.45-438.76

Finding the Fourth Proportional to 1,261.16, 1,890.45 and 438.76

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Solution

The fourth proportional to 1,261.16, 1,890.45 and 438.76 is: 657.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.16 : 1,890.45 = 438.76 : x
  2. Step 2: Convert to fraction form
    1,261.16/1,890.45 = 438.76/x
  3. Step 3: Cross multiply
    1,261.16x = 1,890.45 × 438.76
  4. Step 4: Simplify right side
    1,261.16x = 829,449.12
  5. Step 5: Solve for x
    x = 829,449.12/1,261.16
  6. Step 6: Final answer
    x = 657.69

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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.