Home / 21,729.36-29,985.48-13,345.68

Finding the Fourth Proportional to 21,729.36, 29,985.48 and 13,345.68

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Solution

The fourth proportional to 21,729.36, 29,985.48 and 13,345.68 is: 18,416.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.36 : 29,985.48 = 13,345.68 : x
  2. Step 2: Convert to fraction form
    21,729.36/29,985.48 = 13,345.68/x
  3. Step 3: Cross multiply
    21,729.36x = 29,985.48 × 13,345.68
  4. Step 4: Simplify right side
    21,729.36x = 400,176,620.73
  5. Step 5: Solve for x
    x = 400,176,620.73/21,729.36
  6. Step 6: Final answer
    x = 18,416.40

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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.