Home / 128,232,987.72-177,048,390.89-81,231,770.58

Finding the Fourth Proportional to 128,232,987.72, 177,048,390.89 and 81,231,770.58

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Solution

The fourth proportional to 128,232,987.72, 177,048,390.89 and 81,231,770.58 is: 112,154,871.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,232,987.72 : 177,048,390.89 = 81,231,770.58 : x
  2. Step 2: Convert to fraction form
    128,232,987.72/177,048,390.89 = 81,231,770.58/x
  3. Step 3: Cross multiply
    128,232,987.72x = 177,048,390.89 × 81,231,770.58
  4. Step 4: Simplify right side
    128,232,987.72x = 14,381,954,270,334,640
  5. Step 5: Solve for x
    x = 14,381,954,270,334,640/128,232,987.72
  6. Step 6: Final answer
    x = 112,154,871.58

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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.