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Finding the Fourth Proportional to 128,576.53, 177,434.44 and 71,988.85

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Solution

The fourth proportional to 128,576.53, 177,434.44 and 71,988.85 is: 99,343.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,576.53 : 177,434.44 = 71,988.85 : x
  2. Step 2: Convert to fraction form
    128,576.53/177,434.44 = 71,988.85/x
  3. Step 3: Cross multiply
    128,576.53x = 177,434.44 × 71,988.85
  4. Step 4: Simplify right side
    128,576.53x = 12,773,301,285.99
  5. Step 5: Solve for x
    x = 12,773,301,285.99/128,576.53
  6. Step 6: Final answer
    x = 99,343.96

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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.