Home / 21,160.54-31,705.08-12,815.38

Finding the Fourth Proportional to 21,160.54, 31,705.08 and 12,815.38

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Solution

The fourth proportional to 21,160.54, 31,705.08 and 12,815.38 is: 19,201.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,160.54 : 31,705.08 = 12,815.38 : x
  2. Step 2: Convert to fraction form
    21,160.54/31,705.08 = 12,815.38/x
  3. Step 3: Cross multiply
    21,160.54x = 31,705.08 × 12,815.38
  4. Step 4: Simplify right side
    21,160.54x = 406,312,648.13
  5. Step 5: Solve for x
    x = 406,312,648.13/21,160.54
  6. Step 6: Final answer
    x = 19,201.43

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1.5x scale

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.