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Finding the Fourth Proportional to 912.96, 1,371.06 and 751.80

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Solution

The fourth proportional to 912.96, 1,371.06 and 751.80 is: 1,129.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.96 : 1,371.06 = 751.80 : x
  2. Step 2: Convert to fraction form
    912.96/1,371.06 = 751.80/x
  3. Step 3: Cross multiply
    912.96x = 1,371.06 × 751.80
  4. Step 4: Simplify right side
    912.96x = 1,030,762.91
  5. Step 5: Solve for x
    x = 1,030,762.91/912.96
  6. Step 6: Final answer
    x = 1,129.03

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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.