Home / 128,921.28-193,374.12-76,663.32

Finding the Fourth Proportional to 128,921.28, 193,374.12 and 76,663.32

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Solution

The fourth proportional to 128,921.28, 193,374.12 and 76,663.32 is: 114,990.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.28 : 193,374.12 = 76,663.32 : x
  2. Step 2: Convert to fraction form
    128,921.28/193,374.12 = 76,663.32/x
  3. Step 3: Cross multiply
    128,921.28x = 193,374.12 × 76,663.32
  4. Step 4: Simplify right side
    128,921.28x = 14,824,702,041.28
  5. Step 5: Solve for x
    x = 14,824,702,041.28/128,921.28
  6. Step 6: Final answer
    x = 114,990.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.