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Finding the Fourth Proportional to 910.72, 1,360.16 and 812.80

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Solution

The fourth proportional to 910.72, 1,360.16 and 812.80 is: 1,213.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.72 : 1,360.16 = 812.80 : x
  2. Step 2: Convert to fraction form
    910.72/1,360.16 = 812.80/x
  3. Step 3: Cross multiply
    910.72x = 1,360.16 × 812.80
  4. Step 4: Simplify right side
    910.72x = 1,105,538.05
  5. Step 5: Solve for x
    x = 1,105,538.05/910.72
  6. Step 6: Final answer
    x = 1,213.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.