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Finding the Fourth Proportional to 912.20, 1,368.50 and 364.40

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Solution

The fourth proportional to 912.20, 1,368.50 and 364.40 is: 546.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.20 : 1,368.50 = 364.40 : x
  2. Step 2: Convert to fraction form
    912.20/1,368.50 = 364.40/x
  3. Step 3: Cross multiply
    912.20x = 1,368.50 × 364.40
  4. Step 4: Simplify right side
    912.20x = 498,681.40
  5. Step 5: Solve for x
    x = 498,681.40/912.20
  6. Step 6: Final answer
    x = 546.68

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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.