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Finding the Fourth Proportional to 912.91, 1,368.10 and 790.87

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Solution

The fourth proportional to 912.91, 1,368.10 and 790.87 is: 1,185.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.91 : 1,368.10 = 790.87 : x
  2. Step 2: Convert to fraction form
    912.91/1,368.10 = 790.87/x
  3. Step 3: Cross multiply
    912.91x = 1,368.10 × 790.87
  4. Step 4: Simplify right side
    912.91x = 1,081,989.25
  5. Step 5: Solve for x
    x = 1,081,989.25/912.91
  6. Step 6: Final answer
    x = 1,185.21

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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.