Home / 21,508.03-29,663.31-13,009.78

Finding the Fourth Proportional to 21,508.03, 29,663.31 and 13,009.78

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Solution

The fourth proportional to 21,508.03, 29,663.31 and 13,009.78 is: 17,942.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,508.03 : 29,663.31 = 13,009.78 : x
  2. Step 2: Convert to fraction form
    21,508.03/29,663.31 = 13,009.78/x
  3. Step 3: Cross multiply
    21,508.03x = 29,663.31 × 13,009.78
  4. Step 4: Simplify right side
    21,508.03x = 385,913,137.17
  5. Step 5: Solve for x
    x = 385,913,137.17/21,508.03
  6. Step 6: Final answer
    x = 17,942.75

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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.