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Finding the Fourth Proportional to 730.84, 1,008.48 and 420.28

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Solution

The fourth proportional to 730.84, 1,008.48 and 420.28 is: 579.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.84 : 1,008.48 = 420.28 : x
  2. Step 2: Convert to fraction form
    730.84/1,008.48 = 420.28/x
  3. Step 3: Cross multiply
    730.84x = 1,008.48 × 420.28
  4. Step 4: Simplify right side
    730.84x = 423,843.97
  5. Step 5: Solve for x
    x = 423,843.97/730.84
  6. Step 6: Final answer
    x = 579.94

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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.