Home / 1,280.89-1,921.65-459.22

Finding the Fourth Proportional to 1,280.89, 1,921.65 and 459.22

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Solution

The fourth proportional to 1,280.89, 1,921.65 and 459.22 is: 688.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.89 : 1,921.65 = 459.22 : x
  2. Step 2: Convert to fraction form
    1,280.89/1,921.65 = 459.22/x
  3. Step 3: Cross multiply
    1,280.89x = 1,921.65 × 459.22
  4. Step 4: Simplify right side
    1,280.89x = 882,460.11
  5. Step 5: Solve for x
    x = 882,460.11/1,280.89
  6. Step 6: Final answer
    x = 688.94

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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.