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Finding the Fourth Proportional to 128,299.84, 177,053.72 and 71,711.22

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Solution

The fourth proportional to 128,299.84, 177,053.72 and 71,711.22 is: 98,961.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,299.84 : 177,053.72 = 71,711.22 : x
  2. Step 2: Convert to fraction form
    128,299.84/177,053.72 = 71,711.22/x
  3. Step 3: Cross multiply
    128,299.84x = 177,053.72 × 71,711.22
  4. Step 4: Simplify right side
    128,299.84x = 12,696,738,266.74
  5. Step 5: Solve for x
    x = 12,696,738,266.74/128,299.84
  6. Step 6: Final answer
    x = 98,961.45

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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.