Home / 128,078.20-191,898.60-81,276.40

Finding the Fourth Proportional to 128,078.20, 191,898.60 and 81,276.40

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Solution

The fourth proportional to 128,078.20, 191,898.60 and 81,276.40 is: 121,775.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,078.20 : 191,898.60 = 81,276.40 : x
  2. Step 2: Convert to fraction form
    128,078.20/191,898.60 = 81,276.40/x
  3. Step 3: Cross multiply
    128,078.20x = 191,898.60 × 81,276.40
  4. Step 4: Simplify right side
    128,078.20x = 15,596,827,373.04
  5. Step 5: Solve for x
    x = 15,596,827,373.04/128,078.20
  6. Step 6: Final answer
    x = 121,775.82

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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.