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Finding the Fourth Proportional to 1,043.50, 1,564.73 and 393.78

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Solution

The fourth proportional to 1,043.50, 1,564.73 and 393.78 is: 590.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.50 : 1,564.73 = 393.78 : x
  2. Step 2: Convert to fraction form
    1,043.50/1,564.73 = 393.78/x
  3. Step 3: Cross multiply
    1,043.50x = 1,564.73 × 393.78
  4. Step 4: Simplify right side
    1,043.50x = 616,159.38
  5. Step 5: Solve for x
    x = 616,159.38/1,043.50
  6. Step 6: Final answer
    x = 590.47

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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.