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Finding the Fourth Proportional to 28,428.40, 42,642.60 and 13,629.70

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Solution

The fourth proportional to 28,428.40, 42,642.60 and 13,629.70 is: 20,444.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.40 : 42,642.60 = 13,629.70 : x
  2. Step 2: Convert to fraction form
    28,428.40/42,642.60 = 13,629.70/x
  3. Step 3: Cross multiply
    28,428.40x = 42,642.60 × 13,629.70
  4. Step 4: Simplify right side
    28,428.40x = 581,205,845.22
  5. Step 5: Solve for x
    x = 581,205,845.22/28,428.40
  6. Step 6: Final answer
    x = 20,444.55

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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.