Home / 30,549.12-42,128.25-21,471.55

Finding the Fourth Proportional to 30,549.12, 42,128.25 and 21,471.55

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Solution

The fourth proportional to 30,549.12, 42,128.25 and 21,471.55 is: 29,609.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,549.12 : 42,128.25 = 21,471.55 : x
  2. Step 2: Convert to fraction form
    30,549.12/42,128.25 = 21,471.55/x
  3. Step 3: Cross multiply
    30,549.12x = 42,128.25 × 21,471.55
  4. Step 4: Simplify right side
    30,549.12x = 904,558,761.23
  5. Step 5: Solve for x
    x = 904,558,761.23/30,549.12
  6. Step 6: Final answer
    x = 29,609.98

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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.