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Finding the Fourth Proportional to 128,720.56, 177,631.86 and 70,576.60

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Solution

The fourth proportional to 128,720.56, 177,631.86 and 70,576.60 is: 97,394.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720.56 : 177,631.86 = 70,576.60 : x
  2. Step 2: Convert to fraction form
    128,720.56/177,631.86 = 70,576.60/x
  3. Step 3: Cross multiply
    128,720.56x = 177,631.86 × 70,576.60
  4. Step 4: Simplify right side
    128,720.56x = 12,536,652,730.48
  5. Step 5: Solve for x
    x = 12,536,652,730.48/128,720.56
  6. Step 6: Final answer
    x = 97,394.33

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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.