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Finding the Fourth Proportional to 26,287.60, 39,431.40 and 20,412.40

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Solution

The fourth proportional to 26,287.60, 39,431.40 and 20,412.40 is: 30,618.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,287.60 : 39,431.40 = 20,412.40 : x
  2. Step 2: Convert to fraction form
    26,287.60/39,431.40 = 20,412.40/x
  3. Step 3: Cross multiply
    26,287.60x = 39,431.40 × 20,412.40
  4. Step 4: Simplify right side
    26,287.60x = 804,889,509.36
  5. Step 5: Solve for x
    x = 804,889,509.36/26,287.60
  6. Step 6: Final answer
    x = 30,618.60

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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.