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Finding the Fourth Proportional to 841.28, 1,256.94 and 812.57

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Solution

The fourth proportional to 841.28, 1,256.94 and 812.57 is: 1,214.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.28 : 1,256.94 = 812.57 : x
  2. Step 2: Convert to fraction form
    841.28/1,256.94 = 812.57/x
  3. Step 3: Cross multiply
    841.28x = 1,256.94 × 812.57
  4. Step 4: Simplify right side
    841.28x = 1,021,345.45
  5. Step 5: Solve for x
    x = 1,021,345.45/841.28
  6. Step 6: Final answer
    x = 1,214.04

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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.