Home / 1,281.08-1,921.34-459.34

Finding the Fourth Proportional to 1,281.08, 1,921.34 and 459.34

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Solution

The fourth proportional to 1,281.08, 1,921.34 and 459.34 is: 688.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.08 : 1,921.34 = 459.34 : x
  2. Step 2: Convert to fraction form
    1,281.08/1,921.34 = 459.34/x
  3. Step 3: Cross multiply
    1,281.08x = 1,921.34 × 459.34
  4. Step 4: Simplify right side
    1,281.08x = 882,548.32
  5. Step 5: Solve for x
    x = 882,548.32/1,281.08
  6. Step 6: Final answer
    x = 688.91

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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.