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Finding the Fourth Proportional to 1,008.54, 1,392.03 and 615.69

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Solution

The fourth proportional to 1,008.54, 1,392.03 and 615.69 is: 849.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.54 : 1,392.03 = 615.69 : x
  2. Step 2: Convert to fraction form
    1,008.54/1,392.03 = 615.69/x
  3. Step 3: Cross multiply
    1,008.54x = 1,392.03 × 615.69
  4. Step 4: Simplify right side
    1,008.54x = 857,051.99
  5. Step 5: Solve for x
    x = 857,051.99/1,008.54
  6. Step 6: Final answer
    x = 849.80

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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.