Home / 21,642.12-29,857.75-12,686.36

Finding the Fourth Proportional to 21,642.12, 29,857.75 and 12,686.36

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Solution

The fourth proportional to 21,642.12, 29,857.75 and 12,686.36 is: 17,502.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,642.12 : 29,857.75 = 12,686.36 : x
  2. Step 2: Convert to fraction form
    21,642.12/29,857.75 = 12,686.36/x
  3. Step 3: Cross multiply
    21,642.12x = 29,857.75 × 12,686.36
  4. Step 4: Simplify right side
    21,642.12x = 378,785,984.29
  5. Step 5: Solve for x
    x = 378,785,984.29/21,642.12
  6. Step 6: Final answer
    x = 17,502.26

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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.