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Finding the Fourth Proportional to 128,356.47, 177,138.17 and 70,995.56

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Solution

The fourth proportional to 128,356.47, 177,138.17 and 70,995.56 is: 97,977.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,356.47 : 177,138.17 = 70,995.56 : x
  2. Step 2: Convert to fraction form
    128,356.47/177,138.17 = 70,995.56/x
  3. Step 3: Cross multiply
    128,356.47x = 177,138.17 × 70,995.56
  4. Step 4: Simplify right side
    128,356.47x = 12,576,022,335.86
  5. Step 5: Solve for x
    x = 12,576,022,335.86/128,356.47
  6. Step 6: Final answer
    x = 97,977.32

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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.