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Finding the Fourth Proportional to 84,720.80, 126,935.40 and 55,123.40

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Solution

The fourth proportional to 84,720.80, 126,935.40 and 55,123.40 is: 82,590.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,720.80 : 126,935.40 = 55,123.40 : x
  2. Step 2: Convert to fraction form
    84,720.80/126,935.40 = 55,123.40/x
  3. Step 3: Cross multiply
    84,720.80x = 126,935.40 × 55,123.40
  4. Step 4: Simplify right side
    84,720.80x = 6,997,110,828.36
  5. Step 5: Solve for x
    x = 6,997,110,828.36/84,720.80
  6. Step 6: Final answer
    x = 82,590.24

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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.