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Finding the Fourth Proportional to 216,200.80, 324,128.40 and 91,439.20

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Solution

The fourth proportional to 216,200.80, 324,128.40 and 91,439.20 is: 137,085.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,200.80 : 324,128.40 = 91,439.20 : x
  2. Step 2: Convert to fraction form
    216,200.80/324,128.40 = 91,439.20/x
  3. Step 3: Cross multiply
    216,200.80x = 324,128.40 × 91,439.20
  4. Step 4: Simplify right side
    216,200.80x = 29,638,041,593.28
  5. Step 5: Solve for x
    x = 29,638,041,593.28/216,200.80
  6. Step 6: Final answer
    x = 137,085.72

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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.