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Finding the Fourth Proportional to 661.53, 992.30 and 223.28

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Solution

The fourth proportional to 661.53, 992.30 and 223.28 is: 334.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.53 : 992.30 = 223.28 : x
  2. Step 2: Convert to fraction form
    661.53/992.30 = 223.28/x
  3. Step 3: Cross multiply
    661.53x = 992.30 × 223.28
  4. Step 4: Simplify right side
    661.53x = 221,554.67
  5. Step 5: Solve for x
    x = 221,554.67/661.53
  6. Step 6: Final answer
    x = 334.91

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Double scale
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Similar ratio
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1.5x scale

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.