Home / 1,281.16-1,921.98-415.36

Finding the Fourth Proportional to 1,281.16, 1,921.98 and 415.36

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Solution

The fourth proportional to 1,281.16, 1,921.98 and 415.36 is: 623.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.16 : 1,921.98 = 415.36 : x
  2. Step 2: Convert to fraction form
    1,281.16/1,921.98 = 415.36/x
  3. Step 3: Cross multiply
    1,281.16x = 1,921.98 × 415.36
  4. Step 4: Simplify right side
    1,281.16x = 798,313.61
  5. Step 5: Solve for x
    x = 798,313.61/1,281.16
  6. Step 6: Final answer
    x = 623.12

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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.