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Finding the Fourth Proportional to 913.86, 1,368.72 and 669.60

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Solution

The fourth proportional to 913.86, 1,368.72 and 669.60 is: 1,002.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.86 : 1,368.72 = 669.60 : x
  2. Step 2: Convert to fraction form
    913.86/1,368.72 = 669.60/x
  3. Step 3: Cross multiply
    913.86x = 1,368.72 × 669.60
  4. Step 4: Simplify right side
    913.86x = 916,494.91
  5. Step 5: Solve for x
    x = 916,494.91/913.86
  6. Step 6: Final answer
    x = 1,002.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.