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Finding the Fourth Proportional to 1,042.44, 1,564.08 and 393.36

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Solution

The fourth proportional to 1,042.44, 1,564.08 and 393.36 is: 590.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.44 : 1,564.08 = 393.36 : x
  2. Step 2: Convert to fraction form
    1,042.44/1,564.08 = 393.36/x
  3. Step 3: Cross multiply
    1,042.44x = 1,564.08 × 393.36
  4. Step 4: Simplify right side
    1,042.44x = 615,246.51
  5. Step 5: Solve for x
    x = 615,246.51/1,042.44
  6. Step 6: Final answer
    x = 590.20

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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.