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Finding the Fourth Proportional to 912.89, 1,368.98 and 718.27

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Solution

The fourth proportional to 912.89, 1,368.98 and 718.27 is: 1,077.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.89 : 1,368.98 = 718.27 : x
  2. Step 2: Convert to fraction form
    912.89/1,368.98 = 718.27/x
  3. Step 3: Cross multiply
    912.89x = 1,368.98 × 718.27
  4. Step 4: Simplify right side
    912.89x = 983,292.05
  5. Step 5: Solve for x
    x = 983,292.05/912.89
  6. Step 6: Final answer
    x = 1,077.13

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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.