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Finding the Fourth Proportional to 912.64, 1,368.89 and 450.29

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Solution

The fourth proportional to 912.64, 1,368.89 and 450.29 is: 675.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.64 : 1,368.89 = 450.29 : x
  2. Step 2: Convert to fraction form
    912.64/1,368.89 = 450.29/x
  3. Step 3: Cross multiply
    912.64x = 1,368.89 × 450.29
  4. Step 4: Simplify right side
    912.64x = 616,397.48
  5. Step 5: Solve for x
    x = 616,397.48/912.64
  6. Step 6: Final answer
    x = 675.40

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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.