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Finding the Fourth Proportional to 1,008.18, 1,390.64 and 658.86

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Solution

The fourth proportional to 1,008.18, 1,390.64 and 658.86 is: 908.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.18 : 1,390.64 = 658.86 : x
  2. Step 2: Convert to fraction form
    1,008.18/1,390.64 = 658.86/x
  3. Step 3: Cross multiply
    1,008.18x = 1,390.64 × 658.86
  4. Step 4: Simplify right side
    1,008.18x = 916,237.07
  5. Step 5: Solve for x
    x = 916,237.07/1,008.18
  6. Step 6: Final answer
    x = 908.80

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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.