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Finding the Fourth Proportional to 419.42, 578.76 and 388.46

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Solution

The fourth proportional to 419.42, 578.76 and 388.46 is: 536.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.42 : 578.76 = 388.46 : x
  2. Step 2: Convert to fraction form
    419.42/578.76 = 388.46/x
  3. Step 3: Cross multiply
    419.42x = 578.76 × 388.46
  4. Step 4: Simplify right side
    419.42x = 224,825.11
  5. Step 5: Solve for x
    x = 224,825.11/419.42
  6. Step 6: Final answer
    x = 536.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.