Home / 31,155.14-42,989.02-18,406.56

Finding the Fourth Proportional to 31,155.14, 42,989.02 and 18,406.56

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Solution

The fourth proportional to 31,155.14, 42,989.02 and 18,406.56 is: 25,398.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,155.14 : 42,989.02 = 18,406.56 : x
  2. Step 2: Convert to fraction form
    31,155.14/42,989.02 = 18,406.56/x
  3. Step 3: Cross multiply
    31,155.14x = 42,989.02 × 18,406.56
  4. Step 4: Simplify right side
    31,155.14x = 791,279,975.97
  5. Step 5: Solve for x
    x = 791,279,975.97/31,155.14
  6. Step 6: Final answer
    x = 25,398.06

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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.