Home / 30,687.12-42,350.40-18,115.92

Finding the Fourth Proportional to 30,687.12, 42,350.40 and 18,115.92

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Solution

The fourth proportional to 30,687.12, 42,350.40 and 18,115.92 is: 25,001.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,687.12 : 42,350.40 = 18,115.92 : x
  2. Step 2: Convert to fraction form
    30,687.12/42,350.40 = 18,115.92/x
  3. Step 3: Cross multiply
    30,687.12x = 42,350.40 × 18,115.92
  4. Step 4: Simplify right side
    30,687.12x = 767,216,458.37
  5. Step 5: Solve for x
    x = 767,216,458.37/30,687.12
  6. Step 6: Final answer
    x = 25,001.25

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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.