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Finding the Fourth Proportional to 1,287.78, 1,931.58 and 363.30

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Solution

The fourth proportional to 1,287.78, 1,931.58 and 363.30 is: 544.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.78 : 1,931.58 = 363.30 : x
  2. Step 2: Convert to fraction form
    1,287.78/1,931.58 = 363.30/x
  3. Step 3: Cross multiply
    1,287.78x = 1,931.58 × 363.30
  4. Step 4: Simplify right side
    1,287.78x = 701,743.01
  5. Step 5: Solve for x
    x = 701,743.01/1,287.78
  6. Step 6: Final answer
    x = 544.92

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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.