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Finding the Fourth Proportional to 235,708.72, 325,271.80 and 128,276.45

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Solution

The fourth proportional to 235,708.72, 325,271.80 and 128,276.45 is: 177,018.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,708.72 : 325,271.80 = 128,276.45 : x
  2. Step 2: Convert to fraction form
    235,708.72/325,271.80 = 128,276.45/x
  3. Step 3: Cross multiply
    235,708.72x = 325,271.80 × 128,276.45
  4. Step 4: Simplify right side
    235,708.72x = 41,724,711,789.11
  5. Step 5: Solve for x
    x = 41,724,711,789.11/235,708.72
  6. Step 6: Final answer
    x = 177,018.11

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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.