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Finding the Fourth Proportional to 1,346.72, 2,020.08 and 912.80

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Solution

The fourth proportional to 1,346.72, 2,020.08 and 912.80 is: 1,369.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,346.72 : 2,020.08 = 912.80 : x
  2. Step 2: Convert to fraction form
    1,346.72/2,020.08 = 912.80/x
  3. Step 3: Cross multiply
    1,346.72x = 2,020.08 × 912.80
  4. Step 4: Simplify right side
    1,346.72x = 1,843,929.02
  5. Step 5: Solve for x
    x = 1,843,929.02/1,346.72
  6. Step 6: Final answer
    x = 1,369.20

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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.