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Finding the Fourth Proportional to 660.98, 991.48 and 314.35

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Solution

The fourth proportional to 660.98, 991.48 and 314.35 is: 471.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.98 : 991.48 = 314.35 : x
  2. Step 2: Convert to fraction form
    660.98/991.48 = 314.35/x
  3. Step 3: Cross multiply
    660.98x = 991.48 × 314.35
  4. Step 4: Simplify right side
    660.98x = 311,669.95
  5. Step 5: Solve for x
    x = 311,669.95/660.98
  6. Step 6: Final answer
    x = 471.53

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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.