Home / 30,715.20-42,376.41-18,619.58

Finding the Fourth Proportional to 30,715.20, 42,376.41 and 18,619.58

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Solution

The fourth proportional to 30,715.20, 42,376.41 and 18,619.58 is: 25,688.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,715.20 : 42,376.41 = 18,619.58 : x
  2. Step 2: Convert to fraction form
    30,715.20/42,376.41 = 18,619.58/x
  3. Step 3: Cross multiply
    30,715.20x = 42,376.41 × 18,619.58
  4. Step 4: Simplify right side
    30,715.20x = 789,031,062.05
  5. Step 5: Solve for x
    x = 789,031,062.05/30,715.20
  6. Step 6: Final answer
    x = 25,688.62

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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.