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Finding the Fourth Proportional to 388,196.68, 581,361.90 and 221,479.24

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Solution

The fourth proportional to 388,196.68, 581,361.90 and 221,479.24 is: 331,686.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,196.68 : 581,361.90 = 221,479.24 : x
  2. Step 2: Convert to fraction form
    388,196.68/581,361.90 = 221,479.24/x
  3. Step 3: Cross multiply
    388,196.68x = 581,361.90 × 221,479.24
  4. Step 4: Simplify right side
    388,196.68x = 128,759,591,776.96
  5. Step 5: Solve for x
    x = 128,759,591,776.96/388,196.68
  6. Step 6: Final answer
    x = 331,686.48

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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.