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Finding the Fourth Proportional to 1,502.36, 2,072.64 and 912.80

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Solution

The fourth proportional to 1,502.36, 2,072.64 and 912.80 is: 1,259.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,502.36 : 2,072.64 = 912.80 : x
  2. Step 2: Convert to fraction form
    1,502.36/2,072.64 = 912.80/x
  3. Step 3: Cross multiply
    1,502.36x = 2,072.64 × 912.80
  4. Step 4: Simplify right side
    1,502.36x = 1,891,905.79
  5. Step 5: Solve for x
    x = 1,891,905.79/1,502.36
  6. Step 6: Final answer
    x = 1,259.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.