Home / 30,909.18-42,660.72-20,298.54

Finding the Fourth Proportional to 30,909.18, 42,660.72 and 20,298.54

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Solution

The fourth proportional to 30,909.18, 42,660.72 and 20,298.54 is: 28,015.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,909.18 : 42,660.72 = 20,298.54 : x
  2. Step 2: Convert to fraction form
    30,909.18/42,660.72 = 20,298.54/x
  3. Step 3: Cross multiply
    30,909.18x = 42,660.72 × 20,298.54
  4. Step 4: Simplify right side
    30,909.18x = 865,950,331.35
  5. Step 5: Solve for x
    x = 865,950,331.35/30,909.18
  6. Step 6: Final answer
    x = 28,015.96

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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.