Home / 30,640.07-42,299.42-20,621.18

Finding the Fourth Proportional to 30,640.07, 42,299.42 and 20,621.18

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Solution

The fourth proportional to 30,640.07, 42,299.42 and 20,621.18 is: 28,468.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,640.07 : 42,299.42 = 20,621.18 : x
  2. Step 2: Convert to fraction form
    30,640.07/42,299.42 = 20,621.18/x
  3. Step 3: Cross multiply
    30,640.07x = 42,299.42 × 20,621.18
  4. Step 4: Simplify right side
    30,640.07x = 872,263,639.11
  5. Step 5: Solve for x
    x = 872,263,639.11/30,640.07
  6. Step 6: Final answer
    x = 28,468.07

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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.