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Finding the Fourth Proportional to 157,728.86, 236,396.40 and 78,865.64

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Solution

The fourth proportional to 157,728.86, 236,396.40 and 78,865.64 is: 118,200.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,728.86 : 236,396.40 = 78,865.64 : x
  2. Step 2: Convert to fraction form
    157,728.86/236,396.40 = 78,865.64/x
  3. Step 3: Cross multiply
    157,728.86x = 236,396.40 × 78,865.64
  4. Step 4: Simplify right side
    157,728.86x = 18,643,553,379.70
  5. Step 5: Solve for x
    x = 18,643,553,379.70/157,728.86
  6. Step 6: Final answer
    x = 118,200.01

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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.