Home / 93,078.28-128,390.43-81,170.20

Finding the Fourth Proportional to 93,078.28, 128,390.43 and 81,170.20

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Solution

The fourth proportional to 93,078.28, 128,390.43 and 81,170.20 is: 111,964.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,078.28 : 128,390.43 = 81,170.20 : x
  2. Step 2: Convert to fraction form
    93,078.28/128,390.43 = 81,170.20/x
  3. Step 3: Cross multiply
    93,078.28x = 128,390.43 × 81,170.20
  4. Step 4: Simplify right side
    93,078.28x = 10,421,476,881.19
  5. Step 5: Solve for x
    x = 10,421,476,881.19/93,078.28
  6. Step 6: Final answer
    x = 111,964.65

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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.