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Finding the Fourth Proportional to 84,830.40, 127,245.60 and 81,331.20

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Solution

The fourth proportional to 84,830.40, 127,245.60 and 81,331.20 is: 121,996.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,830.40 : 127,245.60 = 81,331.20 : x
  2. Step 2: Convert to fraction form
    84,830.40/127,245.60 = 81,331.20/x
  3. Step 3: Cross multiply
    84,830.40x = 127,245.60 × 81,331.20
  4. Step 4: Simplify right side
    84,830.40x = 10,349,037,342.72
  5. Step 5: Solve for x
    x = 10,349,037,342.72/84,830.40
  6. Step 6: Final answer
    x = 121,996.80

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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.