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Finding the Fourth Proportional to 929, 1,393.58 and 321

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Solution

The fourth proportional to 929, 1,393.58 and 321 is: 481.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    929 : 1,393.58 = 321 : x
  2. Step 2: Convert to fraction form
    929/1,393.58 = 321/x
  3. Step 3: Cross multiply
    929x = 1,393.58 × 321
  4. Step 4: Simplify right side
    929x = 447,339.18
  5. Step 5: Solve for x
    x = 447,339.18/929
  6. Step 6: Final answer
    x = 481.53

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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.