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Finding the Fourth Proportional to 231,662.64, 319,678.79 and 128,289.41

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Solution

The fourth proportional to 231,662.64, 319,678.79 and 128,289.41 is: 177,030.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,662.64 : 319,678.79 = 128,289.41 : x
  2. Step 2: Convert to fraction form
    231,662.64/319,678.79 = 128,289.41/x
  3. Step 3: Cross multiply
    231,662.64x = 319,678.79 × 128,289.41
  4. Step 4: Simplify right side
    231,662.64x = 41,011,403,358.61
  5. Step 5: Solve for x
    x = 41,011,403,358.61/231,662.64
  6. Step 6: Final answer
    x = 177,030.72

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1.5x scale

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.