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Finding the Fourth Proportional to 128,507.76, 177,334.65 and 71,143.02

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Solution

The fourth proportional to 128,507.76, 177,334.65 and 71,143.02 is: 98,174.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,507.76 : 177,334.65 = 71,143.02 : x
  2. Step 2: Convert to fraction form
    128,507.76/177,334.65 = 71,143.02/x
  3. Step 3: Cross multiply
    128,507.76x = 177,334.65 × 71,143.02
  4. Step 4: Simplify right side
    128,507.76x = 12,616,122,551.64
  5. Step 5: Solve for x
    x = 12,616,122,551.64/128,507.76
  6. Step 6: Final answer
    x = 98,174.01

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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.