Home / 30,891.87-42,666.21-20,328.66

Finding the Fourth Proportional to 30,891.87, 42,666.21 and 20,328.66

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Solution

The fourth proportional to 30,891.87, 42,666.21 and 20,328.66 is: 28,076.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,891.87 : 42,666.21 = 20,328.66 : x
  2. Step 2: Convert to fraction form
    30,891.87/42,666.21 = 20,328.66/x
  3. Step 3: Cross multiply
    30,891.87x = 42,666.21 × 20,328.66
  4. Step 4: Simplify right side
    30,891.87x = 867,346,876.58
  5. Step 5: Solve for x
    x = 867,346,876.58/30,891.87
  6. Step 6: Final answer
    x = 28,076.87

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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.