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Finding the Fourth Proportional to 912.12, 1,368.60 and 392.28

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Solution

The fourth proportional to 912.12, 1,368.60 and 392.28 is: 588.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.12 : 1,368.60 = 392.28 : x
  2. Step 2: Convert to fraction form
    912.12/1,368.60 = 392.28/x
  3. Step 3: Cross multiply
    912.12x = 1,368.60 × 392.28
  4. Step 4: Simplify right side
    912.12x = 536,874.41
  5. Step 5: Solve for x
    x = 536,874.41/912.12
  6. Step 6: Final answer
    x = 588.60

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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.