Home / 128,719.68-193,109.76-39,968.64

Finding the Fourth Proportional to 128,719.68, 193,109.76 and 39,968.64

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Solution

The fourth proportional to 128,719.68, 193,109.76 and 39,968.64 is: 59,962.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.68 : 193,109.76 = 39,968.64 : x
  2. Step 2: Convert to fraction form
    128,719.68/193,109.76 = 39,968.64/x
  3. Step 3: Cross multiply
    128,719.68x = 193,109.76 × 39,968.64
  4. Step 4: Simplify right side
    128,719.68x = 7,718,334,477.93
  5. Step 5: Solve for x
    x = 7,718,334,477.93/128,719.68
  6. Step 6: Final answer
    x = 59,962.35

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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.