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Finding the Fourth Proportional to 84,991.20, 127,486.80 and 51,813.60

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Solution

The fourth proportional to 84,991.20, 127,486.80 and 51,813.60 is: 77,720.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,991.20 : 127,486.80 = 51,813.60 : x
  2. Step 2: Convert to fraction form
    84,991.20/127,486.80 = 51,813.60/x
  3. Step 3: Cross multiply
    84,991.20x = 127,486.80 × 51,813.60
  4. Step 4: Simplify right side
    84,991.20x = 6,605,550,060.48
  5. Step 5: Solve for x
    x = 6,605,550,060.48/84,991.20
  6. Step 6: Final answer
    x = 77,720.40

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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.