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Finding the Fourth Proportional to 402,285.60, 603,428.40 and 121,816.80

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Solution

The fourth proportional to 402,285.60, 603,428.40 and 121,816.80 is: 182,725.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,285.60 : 603,428.40 = 121,816.80 : x
  2. Step 2: Convert to fraction form
    402,285.60/603,428.40 = 121,816.80/x
  3. Step 3: Cross multiply
    402,285.60x = 603,428.40 × 121,816.80
  4. Step 4: Simplify right side
    402,285.60x = 73,507,716,717.12
  5. Step 5: Solve for x
    x = 73,507,716,717.12/402,285.60
  6. Step 6: Final answer
    x = 182,725.20

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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.