Home / 30,873.20-42,607.14-18,778.40

Finding the Fourth Proportional to 30,873.20, 42,607.14 and 18,778.40

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Solution

The fourth proportional to 30,873.20, 42,607.14 and 18,778.40 is: 25,915.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,873.20 : 42,607.14 = 18,778.40 : x
  2. Step 2: Convert to fraction form
    30,873.20/42,607.14 = 18,778.40/x
  3. Step 3: Cross multiply
    30,873.20x = 42,607.14 × 18,778.40
  4. Step 4: Simplify right side
    30,873.20x = 800,093,704.74
  5. Step 5: Solve for x
    x = 800,093,704.74/30,873.20
  6. Step 6: Final answer
    x = 25,915.48

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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.