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Finding the Fourth Proportional to 128,258.64, 176,993.30 and 71,670.02

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Solution

The fourth proportional to 128,258.64, 176,993.30 and 71,670.02 is: 98,902.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,258.64 : 176,993.30 = 71,670.02 : x
  2. Step 2: Convert to fraction form
    128,258.64/176,993.30 = 71,670.02/x
  3. Step 3: Cross multiply
    128,258.64x = 176,993.30 × 71,670.02
  4. Step 4: Simplify right side
    128,258.64x = 12,685,112,645.07
  5. Step 5: Solve for x
    x = 12,685,112,645.07/128,258.64
  6. Step 6: Final answer
    x = 98,902.60

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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.