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Finding the Fourth Proportional to 1,008.56, 1,391.16 and 659.12

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Solution

The fourth proportional to 1,008.56, 1,391.16 and 659.12 is: 909.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.56 : 1,391.16 = 659.12 : x
  2. Step 2: Convert to fraction form
    1,008.56/1,391.16 = 659.12/x
  3. Step 3: Cross multiply
    1,008.56x = 1,391.16 × 659.12
  4. Step 4: Simplify right side
    1,008.56x = 916,941.38
  5. Step 5: Solve for x
    x = 916,941.38/1,008.56
  6. Step 6: Final answer
    x = 909.16

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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.