Home / 128,827.36-177,781.78-72,238.76

Finding the Fourth Proportional to 128,827.36, 177,781.78 and 72,238.76

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Solution

The fourth proportional to 128,827.36, 177,781.78 and 72,238.76 is: 99,689.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,827.36 : 177,781.78 = 72,238.76 : x
  2. Step 2: Convert to fraction form
    128,827.36/177,781.78 = 72,238.76/x
  3. Step 3: Cross multiply
    128,827.36x = 177,781.78 × 72,238.76
  4. Step 4: Simplify right side
    128,827.36x = 12,842,735,337.79
  5. Step 5: Solve for x
    x = 12,842,735,337.79/128,827.36
  6. Step 6: Final answer
    x = 99,689.50

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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.