Home / 30,439.74-42,033.60-19,128.90

Finding the Fourth Proportional to 30,439.74, 42,033.60 and 19,128.90

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Solution

The fourth proportional to 30,439.74, 42,033.60 and 19,128.90 is: 26,414.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,439.74 : 42,033.60 = 19,128.90 : x
  2. Step 2: Convert to fraction form
    30,439.74/42,033.60 = 19,128.90/x
  3. Step 3: Cross multiply
    30,439.74x = 42,033.60 × 19,128.90
  4. Step 4: Simplify right side
    30,439.74x = 804,056,531.04
  5. Step 5: Solve for x
    x = 804,056,531.04/30,439.74
  6. Step 6: Final answer
    x = 26,414.70

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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.