Home / 31,019.60-42,799.56-20,968.40

Finding the Fourth Proportional to 31,019.60, 42,799.56 and 20,968.40

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Solution

The fourth proportional to 31,019.60, 42,799.56 and 20,968.40 is: 28,931.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,019.60 : 42,799.56 = 20,968.40 : x
  2. Step 2: Convert to fraction form
    31,019.60/42,799.56 = 20,968.40/x
  3. Step 3: Cross multiply
    31,019.60x = 42,799.56 × 20,968.40
  4. Step 4: Simplify right side
    31,019.60x = 897,438,293.90
  5. Step 5: Solve for x
    x = 897,438,293.90/31,019.60
  6. Step 6: Final answer
    x = 28,931.33

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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.