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Finding the Fourth Proportional to 661.80, 991.38 and 373.08

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Solution

The fourth proportional to 661.80, 991.38 and 373.08 is: 558.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.80 : 991.38 = 373.08 : x
  2. Step 2: Convert to fraction form
    661.80/991.38 = 373.08/x
  3. Step 3: Cross multiply
    661.80x = 991.38 × 373.08
  4. Step 4: Simplify right side
    661.80x = 369,864.05
  5. Step 5: Solve for x
    x = 369,864.05/661.80
  6. Step 6: Final answer
    x = 558.88

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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.