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Finding the Fourth Proportional to 730.44, 1,008.02 and 398.88

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Solution

The fourth proportional to 730.44, 1,008.02 and 398.88 is: 550.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.44 : 1,008.02 = 398.88 : x
  2. Step 2: Convert to fraction form
    730.44/1,008.02 = 398.88/x
  3. Step 3: Cross multiply
    730.44x = 1,008.02 × 398.88
  4. Step 4: Simplify right side
    730.44x = 402,071.98
  5. Step 5: Solve for x
    x = 402,071.98/730.44
  6. Step 6: Final answer
    x = 550.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.