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Finding the Fourth Proportional to 660.37, 991.19 and 417.06

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Solution

The fourth proportional to 660.37, 991.19 and 417.06 is: 625.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.37 : 991.19 = 417.06 : x
  2. Step 2: Convert to fraction form
    660.37/991.19 = 417.06/x
  3. Step 3: Cross multiply
    660.37x = 991.19 × 417.06
  4. Step 4: Simplify right side
    660.37x = 413,385.70
  5. Step 5: Solve for x
    x = 413,385.70/660.37
  6. Step 6: Final answer
    x = 625.99

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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.