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Finding the Fourth Proportional to 1,009.42, 1,392.97 and 567.31

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Solution

The fourth proportional to 1,009.42, 1,392.97 and 567.31 is: 782.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.42 : 1,392.97 = 567.31 : x
  2. Step 2: Convert to fraction form
    1,009.42/1,392.97 = 567.31/x
  3. Step 3: Cross multiply
    1,009.42x = 1,392.97 × 567.31
  4. Step 4: Simplify right side
    1,009.42x = 790,236.01
  5. Step 5: Solve for x
    x = 790,236.01/1,009.42
  6. Step 6: Final answer
    x = 782.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.