Home / 128,905.20-177,886.62-72,316.44

Finding the Fourth Proportional to 128,905.20, 177,886.62 and 72,316.44

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Solution

The fourth proportional to 128,905.20, 177,886.62 and 72,316.44 is: 99,795.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.20 : 177,886.62 = 72,316.44 : x
  2. Step 2: Convert to fraction form
    128,905.20/177,886.62 = 72,316.44/x
  3. Step 3: Cross multiply
    128,905.20x = 177,886.62 × 72,316.44
  4. Step 4: Simplify right side
    128,905.20x = 12,864,127,082.03
  5. Step 5: Solve for x
    x = 12,864,127,082.03/128,905.20
  6. Step 6: Final answer
    x = 99,795.25

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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.