Home / 30,987.12-42,768.99-20,377.74

Finding the Fourth Proportional to 30,987.12, 42,768.99 and 20,377.74

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Solution

The fourth proportional to 30,987.12, 42,768.99 and 20,377.74 is: 28,125.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,987.12 : 42,768.99 = 20,377.74 : x
  2. Step 2: Convert to fraction form
    30,987.12/42,768.99 = 20,377.74/x
  3. Step 3: Cross multiply
    30,987.12x = 42,768.99 × 20,377.74
  4. Step 4: Simplify right side
    30,987.12x = 871,535,358.28
  5. Step 5: Solve for x
    x = 871,535,358.28/30,987.12
  6. Step 6: Final answer
    x = 28,125.73

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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.