Home / 30,971.16-42,746.99-20,361.78

Finding the Fourth Proportional to 30,971.16, 42,746.99 and 20,361.78

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Solution

The fourth proportional to 30,971.16, 42,746.99 and 20,361.78 is: 28,103.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,971.16 : 42,746.99 = 20,361.78 : x
  2. Step 2: Convert to fraction form
    30,971.16/42,746.99 = 20,361.78/x
  3. Step 3: Cross multiply
    30,971.16x = 42,746.99 × 20,361.78
  4. Step 4: Simplify right side
    30,971.16x = 870,404,704.23
  5. Step 5: Solve for x
    x = 870,404,704.23/30,971.16
  6. Step 6: Final answer
    x = 28,103.72

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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.