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Finding the Fourth Proportional to 128,369.23, 177,157.71 and 71,780.59

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Solution

The fourth proportional to 128,369.23, 177,157.71 and 71,780.59 is: 99,061.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,369.23 : 177,157.71 = 71,780.59 : x
  2. Step 2: Convert to fraction form
    128,369.23/177,157.71 = 71,780.59/x
  3. Step 3: Cross multiply
    128,369.23x = 177,157.71 × 71,780.59
  4. Step 4: Simplify right side
    128,369.23x = 12,716,484,946.85
  5. Step 5: Solve for x
    x = 12,716,484,946.85/128,369.23
  6. Step 6: Final answer
    x = 99,061.78

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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.