Home / 128,989.31-177,995.48-72,389.75

Finding the Fourth Proportional to 128,989.31, 177,995.48 and 72,389.75

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Solution

The fourth proportional to 128,989.31, 177,995.48 and 72,389.75 is: 99,892.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.31 : 177,995.48 = 72,389.75 : x
  2. Step 2: Convert to fraction form
    128,989.31/177,995.48 = 72,389.75/x
  3. Step 3: Cross multiply
    128,989.31x = 177,995.48 × 72,389.75
  4. Step 4: Simplify right side
    128,989.31x = 12,885,048,298.33
  5. Step 5: Solve for x
    x = 12,885,048,298.33/128,989.31
  6. Step 6: Final answer
    x = 99,892.37

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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.