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Finding the Fourth Proportional to 78,858.80, 118,288.20 and 56,625.20

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Solution

The fourth proportional to 78,858.80, 118,288.20 and 56,625.20 is: 84,937.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,858.80 : 118,288.20 = 56,625.20 : x
  2. Step 2: Convert to fraction form
    78,858.80/118,288.20 = 56,625.20/x
  3. Step 3: Cross multiply
    78,858.80x = 118,288.20 × 56,625.20
  4. Step 4: Simplify right side
    78,858.80x = 6,698,092,982.64
  5. Step 5: Solve for x
    x = 6,698,092,982.64/78,858.80
  6. Step 6: Final answer
    x = 84,937.80

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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.