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Finding the Fourth Proportional to 128,358.21, 177,133.54 and 70,996.51

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Solution

The fourth proportional to 128,358.21, 177,133.54 and 70,996.51 is: 97,974.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,358.21 : 177,133.54 = 70,996.51 : x
  2. Step 2: Convert to fraction form
    128,358.21/177,133.54 = 70,996.51/x
  3. Step 3: Cross multiply
    128,358.21x = 177,133.54 × 70,996.51
  4. Step 4: Simplify right side
    128,358.21x = 12,575,862,523.62
  5. Step 5: Solve for x
    x = 12,575,862,523.62/128,358.21
  6. Step 6: Final answer
    x = 97,974.74

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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.