Home / 128,457.72-177,270.39-71,869.50

Finding the Fourth Proportional to 128,457.72, 177,270.39 and 71,869.50

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Solution

The fourth proportional to 128,457.72, 177,270.39 and 71,869.50 is: 99,179.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,457.72 : 177,270.39 = 71,869.50 : x
  2. Step 2: Convert to fraction form
    128,457.72/177,270.39 = 71,869.50/x
  3. Step 3: Cross multiply
    128,457.72x = 177,270.39 × 71,869.50
  4. Step 4: Simplify right side
    128,457.72x = 12,740,334,294.11
  5. Step 5: Solve for x
    x = 12,740,334,294.11/128,457.72
  6. Step 6: Final answer
    x = 99,179.20

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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.