Home / 31,016.60-42,815.07-21,989.15

Finding the Fourth Proportional to 31,016.60, 42,815.07 and 21,989.15

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Solution

The fourth proportional to 31,016.60, 42,815.07 and 21,989.15 is: 30,353.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,016.60 : 42,815.07 = 21,989.15 : x
  2. Step 2: Convert to fraction form
    31,016.60/42,815.07 = 21,989.15/x
  3. Step 3: Cross multiply
    31,016.60x = 42,815.07 × 21,989.15
  4. Step 4: Simplify right side
    31,016.60x = 941,466,782.42
  5. Step 5: Solve for x
    x = 941,466,782.42/31,016.60
  6. Step 6: Final answer
    x = 30,353.65

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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.