Home / 30,900.76-42,639.08-20,140.72

Finding the Fourth Proportional to 30,900.76, 42,639.08 and 20,140.72

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Solution

The fourth proportional to 30,900.76, 42,639.08 and 20,140.72 is: 27,791.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,900.76 : 42,639.08 = 20,140.72 : x
  2. Step 2: Convert to fraction form
    30,900.76/42,639.08 = 20,140.72/x
  3. Step 3: Cross multiply
    30,900.76x = 42,639.08 × 20,140.72
  4. Step 4: Simplify right side
    30,900.76x = 858,781,564.04
  5. Step 5: Solve for x
    x = 858,781,564.04/30,900.76
  6. Step 6: Final answer
    x = 27,791.60

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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.