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Finding the Fourth Proportional to 128,891.25, 177,871.14 and 72,303.84

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Solution

The fourth proportional to 128,891.25, 177,871.14 and 72,303.84 is: 99,779.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,891.25 : 177,871.14 = 72,303.84 : x
  2. Step 2: Convert to fraction form
    128,891.25/177,871.14 = 72,303.84/x
  3. Step 3: Cross multiply
    128,891.25x = 177,871.14 × 72,303.84
  4. Step 4: Simplify right side
    128,891.25x = 12,860,766,447.18
  5. Step 5: Solve for x
    x = 12,860,766,447.18/128,891.25
  6. Step 6: Final answer
    x = 99,779.98

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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.