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Finding the Fourth Proportional to 231,663.15, 319,679.48 and 128,289.92

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Solution

The fourth proportional to 231,663.15, 319,679.48 and 128,289.92 is: 177,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,663.15 : 319,679.48 = 128,289.92 : x
  2. Step 2: Convert to fraction form
    231,663.15/319,679.48 = 128,289.92/x
  3. Step 3: Cross multiply
    231,663.15x = 319,679.48 × 128,289.92
  4. Step 4: Simplify right side
    231,663.15x = 41,011,652,674.99
  5. Step 5: Solve for x
    x = 41,011,652,674.99/231,663.15
  6. Step 6: Final answer
    x = 177,031.40

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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.