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Finding the Fourth Proportional to 218,810.40, 328,021.20 and 129,969.60

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Solution

The fourth proportional to 218,810.40, 328,021.20 and 129,969.60 is: 194,838.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,810.40 : 328,021.20 = 129,969.60 : x
  2. Step 2: Convert to fraction form
    218,810.40/328,021.20 = 129,969.60/x
  3. Step 3: Cross multiply
    218,810.40x = 328,021.20 × 129,969.60
  4. Step 4: Simplify right side
    218,810.40x = 42,632,784,155.52
  5. Step 5: Solve for x
    x = 42,632,784,155.52/218,810.40
  6. Step 6: Final answer
    x = 194,838.93

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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.