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Finding the Fourth Proportional to 78,840.70, 118,261.05 and 64,843.90

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Solution

The fourth proportional to 78,840.70, 118,261.05 and 64,843.90 is: 97,265.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,840.70 : 118,261.05 = 64,843.90 : x
  2. Step 2: Convert to fraction form
    78,840.70/118,261.05 = 64,843.90/x
  3. Step 3: Cross multiply
    78,840.70x = 118,261.05 × 64,843.90
  4. Step 4: Simplify right side
    78,840.70x = 7,668,507,700.10
  5. Step 5: Solve for x
    x = 7,668,507,700.10/78,840.70
  6. Step 6: Final answer
    x = 97,265.85

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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.