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Finding the Fourth Proportional to 438,568.80, 656,686.80 and 279,938.40

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Solution

The fourth proportional to 438,568.80, 656,686.80 and 279,938.40 is: 419,163.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,568.80 : 656,686.80 = 279,938.40 : x
  2. Step 2: Convert to fraction form
    438,568.80/656,686.80 = 279,938.40/x
  3. Step 3: Cross multiply
    438,568.80x = 656,686.80 × 279,938.40
  4. Step 4: Simplify right side
    438,568.80x = 183,831,852,093.12
  5. Step 5: Solve for x
    x = 183,831,852,093.12/438,568.80
  6. Step 6: Final answer
    x = 419,163.09

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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.