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Finding the Fourth Proportional to 86,287.60, 129,431.40 and 51,209.20

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Solution

The fourth proportional to 86,287.60, 129,431.40 and 51,209.20 is: 76,813.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,287.60 : 129,431.40 = 51,209.20 : x
  2. Step 2: Convert to fraction form
    86,287.60/129,431.40 = 51,209.20/x
  3. Step 3: Cross multiply
    86,287.60x = 129,431.40 × 51,209.20
  4. Step 4: Simplify right side
    86,287.60x = 6,628,078,448.88
  5. Step 5: Solve for x
    x = 6,628,078,448.88/86,287.60
  6. Step 6: Final answer
    x = 76,813.80

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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.