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Finding the Fourth Proportional to 1,042.93, 1,564.53 and 393.85

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Solution

The fourth proportional to 1,042.93, 1,564.53 and 393.85 is: 590.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.93 : 1,564.53 = 393.85 : x
  2. Step 2: Convert to fraction form
    1,042.93/1,564.53 = 393.85/x
  3. Step 3: Cross multiply
    1,042.93x = 1,564.53 × 393.85
  4. Step 4: Simplify right side
    1,042.93x = 616,190.14
  5. Step 5: Solve for x
    x = 616,190.14/1,042.93
  6. Step 6: Final answer
    x = 590.83

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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.