Home / 28,128.09-42,202.57-13,143.68

Finding the Fourth Proportional to 28,128.09, 42,202.57 and 13,143.68

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Solution

The fourth proportional to 28,128.09, 42,202.57 and 13,143.68 is: 19,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,128.09 : 42,202.57 = 13,143.68 : x
  2. Step 2: Convert to fraction form
    28,128.09/42,202.57 = 13,143.68/x
  3. Step 3: Cross multiply
    28,128.09x = 42,202.57 × 13,143.68
  4. Step 4: Simplify right side
    28,128.09x = 554,697,073.64
  5. Step 5: Solve for x
    x = 554,697,073.64/28,128.09
  6. Step 6: Final answer
    x = 19,720.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.