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Finding the Fourth Proportional to 905.01, 1,248.95 and 512.04

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Solution

The fourth proportional to 905.01, 1,248.95 and 512.04 is: 706.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.01 : 1,248.95 = 512.04 : x
  2. Step 2: Convert to fraction form
    905.01/1,248.95 = 512.04/x
  3. Step 3: Cross multiply
    905.01x = 1,248.95 × 512.04
  4. Step 4: Simplify right side
    905.01x = 639,512.36
  5. Step 5: Solve for x
    x = 639,512.36/905.01
  6. Step 6: Final answer
    x = 706.64

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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.