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Finding the Fourth Proportional to 1,009.92, 1,515.08 and 393.60

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Solution

The fourth proportional to 1,009.92, 1,515.08 and 393.60 is: 590.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.92 : 1,515.08 = 393.60 : x
  2. Step 2: Convert to fraction form
    1,009.92/1,515.08 = 393.60/x
  3. Step 3: Cross multiply
    1,009.92x = 1,515.08 × 393.60
  4. Step 4: Simplify right side
    1,009.92x = 596,335.49
  5. Step 5: Solve for x
    x = 596,335.49/1,009.92
  6. Step 6: Final answer
    x = 590.48

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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.