Home / 128,981.36-177,994.08-72,392.60

Finding the Fourth Proportional to 128,981.36, 177,994.08 and 72,392.60

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Solution

The fourth proportional to 128,981.36, 177,994.08 and 72,392.60 is: 99,901.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,981.36 : 177,994.08 = 72,392.60 : x
  2. Step 2: Convert to fraction form
    128,981.36/177,994.08 = 72,392.60/x
  3. Step 3: Cross multiply
    128,981.36x = 177,994.08 × 72,392.60
  4. Step 4: Simplify right side
    128,981.36x = 12,885,454,235.81
  5. Step 5: Solve for x
    x = 12,885,454,235.81/128,981.36
  6. Step 6: Final answer
    x = 99,901.68

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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.