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Finding the Fourth Proportional to 912.16, 1,368.61 and 449.93

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Solution

The fourth proportional to 912.16, 1,368.61 and 449.93 is: 675.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.16 : 1,368.61 = 449.93 : x
  2. Step 2: Convert to fraction form
    912.16/1,368.61 = 449.93/x
  3. Step 3: Cross multiply
    912.16x = 1,368.61 × 449.93
  4. Step 4: Simplify right side
    912.16x = 615,778.70
  5. Step 5: Solve for x
    x = 615,778.70/912.16
  6. Step 6: Final answer
    x = 675.08

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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.