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Finding the Fourth Proportional to 28,412.56, 42,620.82 and 8,689.60

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Solution

The fourth proportional to 28,412.56, 42,620.82 and 8,689.60 is: 13,035.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,412.56 : 42,620.82 = 8,689.60 : x
  2. Step 2: Convert to fraction form
    28,412.56/42,620.82 = 8,689.60/x
  3. Step 3: Cross multiply
    28,412.56x = 42,620.82 × 8,689.60
  4. Step 4: Simplify right side
    28,412.56x = 370,357,877.47
  5. Step 5: Solve for x
    x = 370,357,877.47/28,412.56
  6. Step 6: Final answer
    x = 13,035.01

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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.