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Finding the Fourth Proportional to 272,085.90, 408,128.28 and 72,406.20

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Solution

The fourth proportional to 272,085.90, 408,128.28 and 72,406.20 is: 108,609.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,085.90 : 408,128.28 = 72,406.20 : x
  2. Step 2: Convert to fraction form
    272,085.90/408,128.28 = 72,406.20/x
  3. Step 3: Cross multiply
    272,085.90x = 408,128.28 × 72,406.20
  4. Step 4: Simplify right side
    272,085.90x = 29,551,017,867.34
  5. Step 5: Solve for x
    x = 29,551,017,867.34/272,085.90
  6. Step 6: Final answer
    x = 108,609.15

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1.5x scale

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.