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Finding the Fourth Proportional to 660.12, 910.89 and 380.30

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Solution

The fourth proportional to 660.12, 910.89 and 380.30 is: 524.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.12 : 910.89 = 380.30 : x
  2. Step 2: Convert to fraction form
    660.12/910.89 = 380.30/x
  3. Step 3: Cross multiply
    660.12x = 910.89 × 380.30
  4. Step 4: Simplify right side
    660.12x = 346,411.47
  5. Step 5: Solve for x
    x = 346,411.47/660.12
  6. Step 6: Final answer
    x = 524.77

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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.