Home / 21,166.24-29,208.72-12,781.28

Finding the Fourth Proportional to 21,166.24, 29,208.72 and 12,781.28

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Solution

The fourth proportional to 21,166.24, 29,208.72 and 12,781.28 is: 17,637.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,166.24 : 29,208.72 = 12,781.28 : x
  2. Step 2: Convert to fraction form
    21,166.24/29,208.72 = 12,781.28/x
  3. Step 3: Cross multiply
    21,166.24x = 29,208.72 × 12,781.28
  4. Step 4: Simplify right side
    21,166.24x = 373,324,828.76
  5. Step 5: Solve for x
    x = 373,324,828.76/21,166.24
  6. Step 6: Final answer
    x = 17,637.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.