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Finding the Fourth Proportional to 128,782.08, 177,713.28 and 72,192

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Solution

The fourth proportional to 128,782.08, 177,713.28 and 72,192 is: 99,621.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,782.08 : 177,713.28 = 72,192 : x
  2. Step 2: Convert to fraction form
    128,782.08/177,713.28 = 72,192/x
  3. Step 3: Cross multiply
    128,782.08x = 177,713.28 × 72,192
  4. Step 4: Simplify right side
    128,782.08x = 12,829,477,109.76
  5. Step 5: Solve for x
    x = 12,829,477,109.76/128,782.08
  6. Step 6: Final answer
    x = 99,621.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.