Home / 31,133.14-42,979.62-21,114.52

Finding the Fourth Proportional to 31,133.14, 42,979.62 and 21,114.52

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Solution

The fourth proportional to 31,133.14, 42,979.62 and 21,114.52 is: 29,148.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,133.14 : 42,979.62 = 21,114.52 : x
  2. Step 2: Convert to fraction form
    31,133.14/42,979.62 = 21,114.52/x
  3. Step 3: Cross multiply
    31,133.14x = 42,979.62 × 21,114.52
  4. Step 4: Simplify right side
    31,133.14x = 907,494,046.08
  5. Step 5: Solve for x
    x = 907,494,046.08/31,133.14
  6. Step 6: Final answer
    x = 29,148.81

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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.