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Finding the Fourth Proportional to 326,085.36, 489,171.56 and 129,047.28

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Solution

The fourth proportional to 326,085.36, 489,171.56 and 129,047.28 is: 193,588.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,085.36 : 489,171.56 = 129,047.28 : x
  2. Step 2: Convert to fraction form
    326,085.36/489,171.56 = 129,047.28/x
  3. Step 3: Cross multiply
    326,085.36x = 489,171.56 × 129,047.28
  4. Step 4: Simplify right side
    326,085.36x = 63,126,259,271.36
  5. Step 5: Solve for x
    x = 63,126,259,271.36/326,085.36
  6. Step 6: Final answer
    x = 193,588.14

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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.