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Finding the Fourth Proportional to 912.15, 1,368.81 and 450.18

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Solution

The fourth proportional to 912.15, 1,368.81 and 450.18 is: 675.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.15 : 1,368.81 = 450.18 : x
  2. Step 2: Convert to fraction form
    912.15/1,368.81 = 450.18/x
  3. Step 3: Cross multiply
    912.15x = 1,368.81 × 450.18
  4. Step 4: Simplify right side
    912.15x = 616,210.89
  5. Step 5: Solve for x
    x = 616,210.89/912.15
  6. Step 6: Final answer
    x = 675.56

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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.