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Finding the Fourth Proportional to 1,042.55, 1,563.62 and 393.06

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Solution

The fourth proportional to 1,042.55, 1,563.62 and 393.06 is: 589.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.55 : 1,563.62 = 393.06 : x
  2. Step 2: Convert to fraction form
    1,042.55/1,563.62 = 393.06/x
  3. Step 3: Cross multiply
    1,042.55x = 1,563.62 × 393.06
  4. Step 4: Simplify right side
    1,042.55x = 614,594.51
  5. Step 5: Solve for x
    x = 614,594.51/1,042.55
  6. Step 6: Final answer
    x = 589.51

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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.