Home / 31,554.78-43,547.67-20,391.90

Finding the Fourth Proportional to 31,554.78, 43,547.67 and 20,391.90

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Solution

The fourth proportional to 31,554.78, 43,547.67 and 20,391.90 is: 28,142.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,554.78 : 43,547.67 = 20,391.90 : x
  2. Step 2: Convert to fraction form
    31,554.78/43,547.67 = 20,391.90/x
  3. Step 3: Cross multiply
    31,554.78x = 43,547.67 × 20,391.90
  4. Step 4: Simplify right side
    31,554.78x = 888,019,731.87
  5. Step 5: Solve for x
    x = 888,019,731.87/31,554.78
  6. Step 6: Final answer
    x = 28,142.16

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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.