Home / 128,421.81-177,212.46-71,822.25

Finding the Fourth Proportional to 128,421.81, 177,212.46 and 71,822.25

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Solution

The fourth proportional to 128,421.81, 177,212.46 and 71,822.25 is: 99,109.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.81 : 177,212.46 = 71,822.25 : x
  2. Step 2: Convert to fraction form
    128,421.81/177,212.46 = 71,822.25/x
  3. Step 3: Cross multiply
    128,421.81x = 177,212.46 × 71,822.25
  4. Step 4: Simplify right side
    128,421.81x = 12,727,797,605.24
  5. Step 5: Solve for x
    x = 12,727,797,605.24/128,421.81
  6. Step 6: Final answer
    x = 99,109.31

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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.