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Finding the Fourth Proportional to 912.15, 1,364.98 and 668.07

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Solution

The fourth proportional to 912.15, 1,364.98 and 668.07 is: 999.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.15 : 1,364.98 = 668.07 : x
  2. Step 2: Convert to fraction form
    912.15/1,364.98 = 668.07/x
  3. Step 3: Cross multiply
    912.15x = 1,364.98 × 668.07
  4. Step 4: Simplify right side
    912.15x = 911,892.02
  5. Step 5: Solve for x
    x = 911,892.02/912.15
  6. Step 6: Final answer
    x = 999.72

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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.