Home / 128,696.32-177,584.12-72,118

Finding the Fourth Proportional to 128,696.32, 177,584.12 and 72,118

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Solution

The fourth proportional to 128,696.32, 177,584.12 and 72,118 is: 99,513.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,696.32 : 177,584.12 = 72,118 : x
  2. Step 2: Convert to fraction form
    128,696.32/177,584.12 = 72,118/x
  3. Step 3: Cross multiply
    128,696.32x = 177,584.12 × 72,118
  4. Step 4: Simplify right side
    128,696.32x = 12,807,011,566.16
  5. Step 5: Solve for x
    x = 12,807,011,566.16/128,696.32
  6. Step 6: Final answer
    x = 99,513.42

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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.