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Finding the Fourth Proportional to 1,008.07, 1,391.21 and 615.17

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Solution

The fourth proportional to 1,008.07, 1,391.21 and 615.17 is: 848.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.07 : 1,391.21 = 615.17 : x
  2. Step 2: Convert to fraction form
    1,008.07/1,391.21 = 615.17/x
  3. Step 3: Cross multiply
    1,008.07x = 1,391.21 × 615.17
  4. Step 4: Simplify right side
    1,008.07x = 855,832.05
  5. Step 5: Solve for x
    x = 855,832.05/1,008.07
  6. Step 6: Final answer
    x = 848.98

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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.