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Finding the Fourth Proportional to 419.32, 578.02 and 345.51

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Solution

The fourth proportional to 419.32, 578.02 and 345.51 is: 476.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.32 : 578.02 = 345.51 : x
  2. Step 2: Convert to fraction form
    419.32/578.02 = 345.51/x
  3. Step 3: Cross multiply
    419.32x = 578.02 × 345.51
  4. Step 4: Simplify right side
    419.32x = 199,711.69
  5. Step 5: Solve for x
    x = 199,711.69/419.32
  6. Step 6: Final answer
    x = 476.28

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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.