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Finding the Fourth Proportional to 912.40, 1,368.60 and 335.20

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Solution

The fourth proportional to 912.40, 1,368.60 and 335.20 is: 502.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.40 : 1,368.60 = 335.20 : x
  2. Step 2: Convert to fraction form
    912.40/1,368.60 = 335.20/x
  3. Step 3: Cross multiply
    912.40x = 1,368.60 × 335.20
  4. Step 4: Simplify right side
    912.40x = 458,754.72
  5. Step 5: Solve for x
    x = 458,754.72/912.40
  6. Step 6: Final answer
    x = 502.80

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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.