Home / 1,281.36-1,921.59-459.48

Finding the Fourth Proportional to 1,281.36, 1,921.59 and 459.48

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Solution

The fourth proportional to 1,281.36, 1,921.59 and 459.48 is: 689.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.36 : 1,921.59 = 459.48 : x
  2. Step 2: Convert to fraction form
    1,281.36/1,921.59 = 459.48/x
  3. Step 3: Cross multiply
    1,281.36x = 1,921.59 × 459.48
  4. Step 4: Simplify right side
    1,281.36x = 882,932.17
  5. Step 5: Solve for x
    x = 882,932.17/1,281.36
  6. Step 6: Final answer
    x = 689.06

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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.