Home / 128,961.84-177,984.72-72,376.32

Finding the Fourth Proportional to 128,961.84, 177,984.72 and 72,376.32

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Solution

The fourth proportional to 128,961.84, 177,984.72 and 72,376.32 is: 99,889.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,961.84 : 177,984.72 = 72,376.32 : x
  2. Step 2: Convert to fraction form
    128,961.84/177,984.72 = 72,376.32/x
  3. Step 3: Cross multiply
    128,961.84x = 177,984.72 × 72,376.32
  4. Step 4: Simplify right side
    128,961.84x = 12,881,879,049.83
  5. Step 5: Solve for x
    x = 12,881,879,049.83/128,961.84
  6. Step 6: Final answer
    x = 99,889.08

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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.