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Finding the Fourth Proportional to 1,042.79, 1,564.59 and 393.57

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Solution

The fourth proportional to 1,042.79, 1,564.59 and 393.57 is: 590.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.79 : 1,564.59 = 393.57 : x
  2. Step 2: Convert to fraction form
    1,042.79/1,564.59 = 393.57/x
  3. Step 3: Cross multiply
    1,042.79x = 1,564.59 × 393.57
  4. Step 4: Simplify right side
    1,042.79x = 615,775.69
  5. Step 5: Solve for x
    x = 615,775.69/1,042.79
  6. Step 6: Final answer
    x = 590.51

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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.