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Finding the Fourth Proportional to 380.80, 524.80 and 358.40

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Solution

The fourth proportional to 380.80, 524.80 and 358.40 is: 493.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.80 : 524.80 = 358.40 : x
  2. Step 2: Convert to fraction form
    380.80/524.80 = 358.40/x
  3. Step 3: Cross multiply
    380.80x = 524.80 × 358.40
  4. Step 4: Simplify right side
    380.80x = 188,088.32
  5. Step 5: Solve for x
    x = 188,088.32/380.80
  6. Step 6: Final answer
    x = 493.93

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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.