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Finding the Fourth Proportional to 128,239.76, 176,955.60 and 70,875.56

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Solution

The fourth proportional to 128,239.76, 176,955.60 and 70,875.56 is: 97,799.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239.76 : 176,955.60 = 70,875.56 : x
  2. Step 2: Convert to fraction form
    128,239.76/176,955.60 = 70,875.56/x
  3. Step 3: Cross multiply
    128,239.76x = 176,955.60 × 70,875.56
  4. Step 4: Simplify right side
    128,239.76x = 12,541,827,245.14
  5. Step 5: Solve for x
    x = 12,541,827,245.14/128,239.76
  6. Step 6: Final answer
    x = 97,799.83

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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.