Home / 128,974.94-177,985.41-72,386.31

Finding the Fourth Proportional to 128,974.94, 177,985.41 and 72,386.31

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Solution

The fourth proportional to 128,974.94, 177,985.41 and 72,386.31 is: 99,893.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,974.94 : 177,985.41 = 72,386.31 : x
  2. Step 2: Convert to fraction form
    128,974.94/177,985.41 = 72,386.31/x
  3. Step 3: Cross multiply
    128,974.94x = 177,985.41 × 72,386.31
  4. Step 4: Simplify right side
    128,974.94x = 12,883,707,063.74
  5. Step 5: Solve for x
    x = 12,883,707,063.74/128,974.94
  6. Step 6: Final answer
    x = 99,893.10

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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.