Home / 30,438.23-42,009.57-18,505.31

Finding the Fourth Proportional to 30,438.23, 42,009.57 and 18,505.31

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Solution

The fourth proportional to 30,438.23, 42,009.57 and 18,505.31 is: 25,540.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,438.23 : 42,009.57 = 18,505.31 : x
  2. Step 2: Convert to fraction form
    30,438.23/42,009.57 = 18,505.31/x
  3. Step 3: Cross multiply
    30,438.23x = 42,009.57 × 18,505.31
  4. Step 4: Simplify right side
    30,438.23x = 777,399,905.77
  5. Step 5: Solve for x
    x = 777,399,905.77/30,438.23
  6. Step 6: Final answer
    x = 25,540.25

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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.