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Finding the Fourth Proportional to 128,989.35, 177,999.31 and 71,632.30

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Solution

The fourth proportional to 128,989.35, 177,999.31 and 71,632.30 is: 98,849.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.35 : 177,999.31 = 71,632.30 : x
  2. Step 2: Convert to fraction form
    128,989.35/177,999.31 = 71,632.30/x
  3. Step 3: Cross multiply
    128,989.35x = 177,999.31 × 71,632.30
  4. Step 4: Simplify right side
    128,989.35x = 12,750,499,973.71
  5. Step 5: Solve for x
    x = 12,750,499,973.71/128,989.35
  6. Step 6: Final answer
    x = 98,849.25

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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.