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Finding the Fourth Proportional to 84,801.40, 127,202.10 and 78,580.60

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Solution

The fourth proportional to 84,801.40, 127,202.10 and 78,580.60 is: 117,870.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,801.40 : 127,202.10 = 78,580.60 : x
  2. Step 2: Convert to fraction form
    84,801.40/127,202.10 = 78,580.60/x
  3. Step 3: Cross multiply
    84,801.40x = 127,202.10 × 78,580.60
  4. Step 4: Simplify right side
    84,801.40x = 9,995,617,339.26
  5. Step 5: Solve for x
    x = 9,995,617,339.26/84,801.40
  6. Step 6: Final answer
    x = 117,870.90

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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.